[llvm-exegesis] Add partial X87 support.

Summary:
This enables the X86-specific X86FloatingPointStackifierPass, and allow
llvm-exegesis to generate and measure X87 latency/uops for some FP ops.

Reviewers: gchatelet

Subscribers: tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48592

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335815 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed