Wraps lazily generated builtins in an extern "C" context

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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193896 91177308-0d34-0410-b5e6-96231b3b80d8