Port 519bd47f

Original Commit Message:

    With the exception of the InterpreterEntryTrampoline, all builtins are
    now isolate-independent and can be embedded into the binary.

    This CL updates the corresponding list and also contains a few smallish
    tweaks to support having these builtins off the heap:

    * wasm: copy the off-heap builtin, not its trampoline.
    * Code::contains: support off-heap builtins.
    * JSFunction::is_compiled: compare builtin index instead of identity
      (this is relevant during mksnapshot when we transition from the
      on-heap builtin to its off-heap representation + the trampoline).
    * Remove old DCHECKs.
    * A few tweaks in macro-assembler ports that have snuck in recently.

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

Change-Id: Ib16ce35f5ebdade42720f536ac521c79e7c46778
Reviewed-on: https://chromium-review.googlesource.com/1042927Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52973}