Reviewers: Sven,

Description:
Add asserts to ensure that we:
1) Don't make a call to C without having a valid frame on the stack.
2) Don't generate a call to a stub while generating a stub, unless we can be
sure that the stub we are calling has already been generated (the stub
generation code is not reentrant wrt. GC).

Please review this at http://codereview.chromium.org/7891042/

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

Affected files:
  M     include/v8.h
  M     src/arm/builtins-arm.cc
  M     src/arm/code-stubs-arm.h
  M     src/arm/code-stubs-arm.cc
  M     src/arm/codegen-arm.cc
  M     src/arm/debug-arm.cc
  M     src/arm/deoptimizer-arm.cc
  M     src/arm/full-codegen-arm.cc
  M     src/arm/ic-arm.cc
  M     src/arm/lithium-codegen-arm.cc
  M     src/arm/macro-assembler-arm.h
  M     src/arm/macro-assembler-arm.cc
  M     src/arm/regexp-macro-assembler-arm.cc
  M     src/arm/stub-cache-arm.cc
  M     src/builtins.cc
  M     src/code-stubs.h
  M     src/code-stubs.cc
  M     src/deoptimizer.cc
  M     src/frames.h
  M     src/ia32/builtins-ia32.cc
  M     src/ia32/code-stubs-ia32.h
  M     src/ia32/code-stubs-ia32.cc
  M     src/ia32/codegen-ia32.cc
  M     src/ia32/debug-ia32.cc
  M     src/ia32/deoptimizer-ia32.cc
  M     src/ia32/full-codegen-ia32.cc
  M     src/ia32/ic-ia32.cc
  M     src/ia32/lithium-codegen-ia32.cc
  M     src/ia32/macro-assembler-ia32.h
  M     src/ia32/macro-assembler-ia32.cc
  M     src/ia32/regexp-macro-assembler-ia32.cc
  M     src/ia32/stub-cache-ia32.cc
  M     src/macro-assembler.h
  M     src/x64/builtins-x64.cc
  M     src/x64/code-stubs-x64.h
  M     src/x64/code-stubs-x64.cc
  M     src/x64/codegen-x64.cc
  M     src/x64/debug-x64.cc
  M     src/x64/deoptimizer-x64.cc
  M     src/x64/full-codegen-x64.cc
  M     src/x64/ic-x64.cc
  M     src/x64/lithium-codegen-x64.cc
  M     src/x64/macro-assembler-x64.h
  M     src/x64/macro-assembler-x64.cc
  M     src/x64/regexp-macro-assembler-x64.cc
  M     src/x64/stub-cache-x64.cc


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