Reviewers: Yang,

Description:
Reland "Prevent liveedit on or under generators with open activations"

The change relative to the previous CL is a logic change in
DropActivationsInActiveThreadImpl.  The previous CL skipped the matcher
unless the frame was a JS frame; this was correct for
MultipleFunctionTarget but not for SingleFrameTarget.

I have not been able to reproduce the original failures on either
architecture (ia32 or x64; stack frame dropping is unsupported on other
architectures).

[email protected]
LOG=N
TEST=mjsunit/harmony/generators-debug-liveedit.js
BUG=

Please review this at https://codereview.chromium.org/270283002/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+221, -21 lines):
  M src/liveedit.h
  M src/liveedit.cc
  M src/liveedit-debugger.js
  M src/objects.h
  M src/objects-inl.h
  A test/mjsunit/harmony/generators-debug-liveedit.js
  M test/mjsunit/mjsunit.status


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