Because not initializing fields can be, you know, dangerous.

Review-Url: https://codereview.chromium.org/1952703002
Cr-Commit-Position: refs/heads/master@{#36071}

This CL removes the Config templatization from the types. It is not
necessary anymore, after the HeapTypes have been removed.

The CL also changes the type hierarchy - the specific type kinds are
not inner classes of the Type class and they do not inherit from Type.
This is partly because it seems impossible to make this work without
templates. Instead, a new TypeBase class is introduced and all the
structural (i.e., non-bitset) types inherit from it.

The bitset type still requires the bit-munging hack and some nasty
reinterpret-casts to pretend bitsets are of type Type*. Additionally,
there is now the same hack for TypeBase - all pointers to the sub-types
of TypeBase are reinterpret-casted to Type*. This is to keep the type
constructors in inline method definitions (although it is unclear how
much that actually buys us).

In future, we would like to move to a model where we encapsulate Type*
into a class (or possibly use Type where we used to use Type*). This
would loosen the coupling between bitset size and pointer size, and
eventually we would be able to have more bits.

TBR=bradnelson@chromium.org

Review URL: https://codereview.chromium.org/1655833002

Cr-Commit-Position: refs/heads/master@{#33656}

* Add caching to handling of dangling loads
* Add two unittests for load elimination on escaped objects

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1619103004

Cr-Commit-Position: refs/heads/master@{#33498}

* Treat Select nodes as escaping
* Correctly void virtual field information
  after a store to a non-const index
* Add a shortcut if all allocates escape
* Add a shortcut if no allocates are discovered
* Only reduce FrameState/StateValues nodes if they
  have virtual allocates as input (transitively)
* Fix bug in FrameState/StateValues duplication
* Add check to verifier: First 3 inputs of FrameState
  must be StateValues

R=mstarzinger@chromium.org
BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1583213003

Cr-Commit-Position: refs/heads/master@{#33406}

This bug improves performance of escape analysis.

* A allocation discovery phase  (EscapeAnalysis::AssignAliases)
  ensures compact representation of virtual state
* Node revisiting in EscapeStatusAnalysis has been improved
* Escape analysis no longer requires a trimmed graph

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1559123003

Cr-Commit-Position: refs/heads/master@{#33267}

Deopt support is added on two levels. On the IR level,
a new ObjectState node is added, which represenents an
object to be materialized. ObjectState nodes appear as
inputs of FrameState and StateValues nodes. On the
instruction select/code-generation level, the
FrameStateDescriptor class handles the nesting
introduced by ObjectState, and ensures that deopt code
with CAPTURED_OBJECT/DUPLICATED_OBJECT entries are
generated similarly to what crankshaft's escape
analysis does.

Two unittests test correctness of the IR level implementation.

Correctness for instruction selection / code generation
is tested by mjsunit tests.

R=jarin@chromium.org,mstarzinger@chromium.org
BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1485183002

Cr-Commit-Position: refs/heads/master@{#33115}

Move replacements out of virtual object. Replacements are
global to the graph and are not dependent on the virtual
state (after they are discovered).

R=mstarzinger@chromium.org
BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1527533002

Cr-Commit-Position: refs/heads/master@{#32838}

MachineType is now a class with two enum fields:
- MachineRepresentation
- MachineSemantic

Both enums are usable on their own, and this change switches some places from using MachineType to use just MachineRepresentation. Most notably:
- register allocator now uses just the representation.
- Phi and Select nodes only refer to representations.

Review URL: https://codereview.chromium.org/1513543003

Cr-Commit-Position: refs/heads/master@{#32738}

R=mstarzinger@chromium.org
BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1491903002

Cr-Commit-Position: refs/heads/master@{#32523}

This is the first part of escape analysis for turbofan.
At the moment, there is no deopt support, and support
for loops is partial (only binary Phis are handled).

The CL includes 4 unittests.

There are also 8 new mjsunit tests, some of which are
skiped as they require features not yet implemented.

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1457683003

Cr-Commit-Position: refs/heads/master@{#32498}