has_trivial_default_constructor hooked up to clang. Filed...

has_trivial_default_constructor hooked up to clang.  Filed http://llvm.org/bugs/show_bug.cgi?id=8097 to take care of void and arrays of incomplete types which don't work yet.  If there is some reasons we don't want to handle these types in the compiler, I can handle them in the library.

llvm-svn: 113205