Implemented frequency based cost/saving analysis and related options. The pass is now in a state ready to be turne on in the pipeline (in follow up). Differential Revision: http://reviews.llvm.org/D32783 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302967 91177308-0d34-0410-b5e6-96231b3b80d8
No bots have yelled yet, but this test references an x86 intrinsic. Also, it invokes llc on x86 IR. Fixup to r277315. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277316 91177308-0d34-0410-b5e6-96231b3b80d8