Enable --salvage-stale-profile for AutoFDO

This enables the compiler to salvage stale profile by fuzzy matching and
use the remapped location for sample profile query.

This functionality was added to Clang in https://reviews.llvm.org/D147456

Test: presubmit
Test: graphics performance test
Change-Id: I8a2e6e1ebed82e8d0fa8ec2bd2edd87e904fb311