This addresses several TODOs:
  - Push and Pop requests can be queued up so that arrays of Registers
    can be pushed efficiently, with just one PrepareForPush/Pop.
  - PushMultipleTimes now takes an Operand. This allows variable-length
    arguments arrays to be initialized, for example.
  - A NoUseRealAbortsScope has been added to Abort so that
    AssertStackConsistency can be called from PrepareForPush without
    introducing infinite recursion.

BUG=
R=rmcilroy@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/170623002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19474 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jochen@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/169733003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19473 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jochen@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/169403003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19472 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/170613002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19471 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/170243003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19470 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Notes:
- The functions already did the same thing -> no changes in logic.
- One less glue function needed now.

R=ulan@chromium.org
BUG=v8:3126
LOG=N

Review URL: https://codereview.chromium.org/169853002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19469 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=danno@chromium.org

Review URL: https://codereview.chromium.org/171713004

Patch from Daniel Clifford <danno@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19468 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/170843008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19467 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jkummerow@chromium.org
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/171783002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19464 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Port: r19457 (9d8d5f3)

Original commit message:
This time we don't go through the premonomorphic state for
the Array call target caches to avoid losing information from
allocation sites that aren't only used once, but where the
resulting array is used heavily.

Patch from Kasper Lund <kasperl@chromium.org>.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/170903002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19463 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/170433006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19462 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This instruction is used as a guard for the constant pool.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/170673003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19461 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

We only seem to force scavenge in our cctest test suite, so this is
expected to fix some flakiness in our tests, but it will not
improve stability of v8 itself.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/167423004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19460 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Port r19430 (70bb668)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/170343004

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19459 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

LOG=N
R=dslomov@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/170253008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19458 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

target caches.

This time we don't go through the premonomorphic state for
the Array call target caches to avoid losing information from
allocation sites that aren't only used once, but where the
resulting array is used heavily.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/169683003

Patch from Kasper Lund <kasperl@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19457 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/170503004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19456 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/170563002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19455 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

TBR=yurys@chromium.org,dslomov@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/170543002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19454 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/170443003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19453 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This fixes a forgotten parameter when calling the script's toplevel method and adds the same usage message as in the bash script.

BUG=
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/164373015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19450 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

LOG=N
TBR=yurys@chromium.org,dslomov@chromium.org

Review URL: https://codereview.chromium.org/166193005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19449 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/170513002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19448 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/167463004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19447 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/170493002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19446 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

LOG=N
R=dslomov@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/166383002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Code generation would fail when assembling a branch to a label that is bound
outside the immediate range of the instruction. A64 is sensitive to this, as the
various branching instructions have different ranges, going down to +-32KB for
TBZ/TBNZ.  The MacroAssembler is augmented to handle branches to targets that
may exceed the immediate range of instructions.

When branching backward to a label exceeding the instruction range, the
MacroAssembler can simply tweak the generated code to use an unconditional
branch with a longer range. For example instead of
    B(cond, &label);
the MacroAssembler can generate:
    b(InvertCondition(cond), &done);
    b(&label);
    bind(&done);

Since the target is not known when the branch is emitted, forward branches uses
a different mechanism. The MacroAssembler keeps track of forward branches to
unbound labels. When the code generation approaches the end of the range of a
branch, a veneer is generated for the branch.

BUG=v8:3148
LOG=Y
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/169893002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

- To ease a line-by-line review, the script is intentionally close to the former bash version
- Disambiguate the existing "-r" option for reviewer in the other scripts
- The options design will be refactored in a follow up CL

TEST=python -m unittest test_scripts.ScriptTest.testMergeToBranch
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/163183004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=rmcilroy@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/168903004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19442 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jochen@chromium.org

BUG=

Review URL: https://codereview.chromium.org/170403003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19441 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=chromium:343964
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/170343003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19440 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

The result should be just stored in a W register

BUG=none
R=m.m.capewell@googlemail.com, ulan@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/170363002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19439 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/170073003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19438 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Otherwise we may crash.

BUG=None
LOG=N
R=alph@chromium.org, hpayer@chromium.org

Review URL: https://codereview.chromium.org/169773002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19437 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jkummerow@chromium.org, danno@chromium.org

Review URL: https://codereview.chromium.org/144663005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19436 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=dslomov@chromium.org, svenpanne@chromium.org
BUG=v8:2938
LOG=N

Review URL: https://codereview.chromium.org/169783002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19435 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Arithmetic right shifting is *not* division in two's complement
representation, only in one's complement. So we convert to one's
complement, shift, and go back to two's complement. By permutating the
last steps, one can get efficient branch-free code. This insight comes
from the paleozoic era of computer science, see the paper from 1976:

   Guy Lewis Steele Jr.: "Arithmetic Shifting Considered Harmful"
   ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-378.pdf

This results in better and more correct code than our previous
"neg/shift/neg" dance.

LOG=y
BUG=v8:3151
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/166793002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jarin@chromium.org
BUG=v8:2938
LOG=N

Review URL: https://codereview.chromium.org/169513002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19433 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This reverts commit r19410.

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/169113005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19432 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUG=
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/163963003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19431 ce2b1a6d-e550-0410-aec6-3dcde31c8c00