is no need to go through the driver indirection here, and it clutters
things up as dependencies can sneak in for specific things the driver is
doing.
llvm-svn: 191107
This adds a test to make sure we define _WCHAR_T_DEFINED and
_NATIVE_WCHAR_T_DEFINED correctly in the preprocessor, and updates
stddef.h to set it when typedeffing wchar_t.
llvm-svn: 180918