[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.
To recognize such patterns flags BreakScope and ContinueScope are
temporarily turned off while parsing condition expression.

http://llvm-reviews.chandlerc.com/D2018

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