[BOLT] Add option to ignore function hash in profile

Summary:
When we make changes to MCInst opcodes (or get changes from upstream),
a hash value for BinaryFunction changes. As a result, we are unable
to match profile generated by a previous version of BOLT.

Add option `-profile-ignore-hash` to match profile while ignoring
function hash value. With this option we match functions with common
names using the number of basic blocks.

(cherry picked from FBD7983269)