Port d8131cd6

Original Commit Message:

    Stubs and builtins are very similar. The main differences are that
    stubs can be parameterized and may be generated at runtime, whereas
    builtins are generated at mksnapshot-time and shipped with the snapshot
    (or embedded into the binary).

    My main motivation for these conversions is that we can generate
    faster calls and jumps to (embedded) builtins callees from (embedded)
    builtin callers. Instead of going through the builtins constants table
    indirection, we can simply do a pc-relative call/jump.

    This also unlocks other refactorings, e.g. removal of
    CallRuntimeDelayed.

R=jgruber@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I193e4275470d492912a7d0f8523c3b8c29f1b146
Reviewed-on: https://chromium-review.googlesource.com/1050732
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#53081}