Reviewers: ulan,

Message:
Please take a look at the ia32 port. I'll continue with other platforms later.

Description:
Debugger: use debug break slots to break at function exit.

By not having to patch the return sequence, we don't overwrite it
and therefore don't have to keep the original copy of the code around.

[email protected]
BUG=v8:4269
LOG=N

Please review this at https://codereview.chromium.org/1234833003/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+156, -504 lines):
  M src/assembler.h
  M src/assembler.cc
  M src/debug.h
  M src/debug.cc
  M src/factory.cc
  M src/full-codegen.cc
  M src/heap/mark-compact.h
  M src/heap/mark-compact.cc
  M src/heap/objects-visiting-inl.h
  M src/ia32/assembler-ia32.h
  M src/ia32/assembler-ia32.cc
  M src/ia32/assembler-ia32-inl.h
  M src/ia32/debug-ia32.cc
  M src/ia32/full-codegen-ia32.cc
  M src/ic/ic.h
  M src/ic/ic.cc
  M src/ic/ic-inl.h
  M src/liveedit.cc
  M src/objects.h
  M src/objects.cc
  M src/objects-debug.cc
  M src/objects-inl.h
  M src/objects-printer.cc
  M src/runtime/runtime-debug.cc
  M test/cctest/test-debug.cc


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