[PATCH] Allow C11 static assert declaration as clause-1 in for loops.

[Rachel Craik]

Hi rsmith, hfinkel,

According to the C11 standard, `_Static_assert` should be allowed as clause-1 in a for loop.

For example:
```
for (_Static_assert(1, "1 is nonzero");;) {}
```

The relevant section of the C11 grammar is:
//for ( declaration expressionopt ; expressionopt ) statement
declaration:
  declaration-specifiers init-declarator-listopt ;
  static_assert-declaration//

It is not allowed in C++11, where the for statement has the form:
//for ( for-init-statement conditionopt; expressionopt) statement//
and for-init-statement can only be an //expression-statement// or a //simple-declaration//, not a //static_assert-declaration//

http://reviews.llvm.org/D9113

Files:
  include/clang/Parse/Parser.h
  lib/Parse/ParseDeclCXX.cpp
  lib/Parse/ParseStmt.cpp
  lib/Sema/SemaStmt.cpp
  test/Parser/static-assert.c
  test/Parser/static-assert.cpp

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