CodeGen: support hint intrinsics from ACLE on AArch64

This adds support for the ACLE hint intrinsics on AArch64 similar to ARM.  This
is required to properly support ACLE on AArch64.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212890 91177308-0d34-0410-b5e6-96231b3b80d8
Headers: add hint intrinsics to arm_acle.h

This adds the ARM ACLE hint intrinsic wrappers to arm_acle.h.  These need to be
protected with a !defined(_MSC_VER) since MSVC (and thus clang in compatibility
mode) provide these wrappers as proper builtin intrinsics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212891 91177308-0d34-0410-b5e6-96231b3b80d8