Add _mm_prefetch and some others as MS builtins

Add _mm_prefetch and some others as MS builtins

This patch adds several built-ins that are required for ms
compatibility. _mm_prefetch must be a built-in because it takes a
compile-time constant argument and our prior approach of using a #define
to the current built-in doesn't work in the presence of re-declaration
of _mm_prefetch. The others can be obtained by including the windows
system headers. If a user includes the windows system headers but not
intrin.h they still need to work and therefore must be built-in because
we don't get a chance to implement them in intrin.h in this case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201734 91177308-0d34-0410-b5e6-96231b3b80d8