[PATCH] Fix to PR8880 (clang dies processing a for loop).

[Serge Pavlov]

sepavloff added you to the CC list for the revision "Fix to PR8880 (clang dies processing a for loop).".

Due to statement expressions supported as GCC extension, it is possible
to put 'break' or 'continue' into a loop/switch statement but outside
its body, for example:

    for ( ; ({ if (first) { first = 0; continue; } 0; }); )

Such usage must be diagnosed as an error, GCC rejects it. With this
change clang interprets such constructs as GCC in C++ mode: 'break'
and 'continue' in the 3rd expression refer to the loop itself, in
the 1st and 2nd expressions - to outer loop.

This revision is reincarnation of http://llvm-reviews.chandlerc.com/D2018, which was accidentally closed.

http://llvm-reviews.chandlerc.com/D2518

Files:
  include/clang/Sema/Scope.h
  lib/Parse/ParseStmt.cpp
  lib/Sema/Scope.cpp
  test/CodeGen/PR8880.c
  test/Parser/bad-control.c
  test/Sema/statements.c
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