Add flag trap_on_stub_deopt. We want to be able to trap on hydrogen stub bailouts.

Add flag trap_on_stub_deopt. We want to be able to trap on hydrogen stub bailouts.

BUG=
R=svenpanne@chromium.org, verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16121

[mvstanton, 2013-08-07 15:41:37]

PTAL, thanks!
--Michael

[Toon Verwaest, 2013-08-07 16:46:30]

lgtm

[Sven Panne, 2013-08-08 06:31:28]

LGTM iff the copy-n-paste is removed (it's the small things that make our code
base so ugly...).

Furthermore, adding this on MIPS would be nice, too, because it is a no-brainer
and keeps our platforms in sync.

https://codereview.chromium.org/22593003/diff/1/src/arm/lithium-codegen-arm.cc
File src/arm/lithium-codegen-arm.cc (right):

https://codereview.chromium.org/22593003/diff/1/src/arm/lithium-codegen-arm.c...
src/arm/lithium-codegen-arm.cc:809: (FLAG_trap_on_stub_deopt &&
info()->IsStub())) {
To remove the copy-n-paste, please make this a predicate on CompilationInfo:

   if (info()->ShouldTrapOnDeopt()) {
      ...
   }

[mvstanton, 2013-08-09 08:22:20]

Thanks guys. Thx Sven for the pointers, I've updated on those lines. I've got
the lgtm so blast off :D.
--Michael

[mvstanton, 2013-08-09 08:24:35]

Committed patchset #2 manually as r16121 (presubmit successful).