Wraps lazily generated builtins in an extern "C" context

Differential Revision: http://llvm-reviews.chandlerc.com/D2082

Adds a lang_c LinkageSpecDecl to lazily generated builtins. This enforces correct 
behavior for builtins in a variety of cases without special treatment elsewhere within 
the compiler (special treatment is removed by the patch). It also allows for C++ 
overloads of builtin functions, which Microsoft uses in their headers e.g. 
_InterlockedExchangeAdd is an extern C builtin for the long type but an inline wrapper 
for int type.

llvm-svn: 193896