[BOLT] Restore macro-fusion optimization

Summary:
Restore the optimization with some modifications:
  * Only enabled in relocation mode.
  * Covers instructions other than TEST/CMP.
  * Prints missed macro-fusion opportunities for input.
  * By default enabled for all hot code.
  * Without profile enabled for all code.

The new command-line option:
  -align-macro-fusion - fix instruction alignment for macro-fusion (x86 relocation mode)
      =none   - do not insert alignment no-ops for macro-fusion
      =hot    - only insert alignment no-ops on hot execution paths (default)
      =all    - always align instructions to allow macro-fusion

(cherry picked from FBD7644042)