[PPC CodeGen] Expand the bitreverse.i64 intrinsic.

Differential Revision: https://reviews.llvm.org/D34908
Fix PR: https://bugs.llvm.org/show_bug.cgi?id=33093

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307563 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed