Implements some of the more commonly used intrinsics in Intrin.h
Differential Revision: http://llvm-reviews.chandlerc.com/D1766



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191590 91177308-0d34-0410-b5e6-96231b3b80d8
Typo correction: _int64 -> __int64.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191592 91177308-0d34-0410-b5e6-96231b3b80d8