[BOLT][NFC] Print functions after attaching profile (-print-profile)

Add an extra point of dumping functions: immediately after attaching the profile information.
This dumping is enabled by newly introduced `-print-profile` and `-print-all`.

The reason is that in `aggregate-only`/perf2bolt mode BOLT may not reach the point of
printing the function after CFG is constructed (`-print-cfg`), while we may still want to inspect
the attached profile, especially for diff'ing purposes.

Reviewed By: #bolt, rafauler

Differential Revision: https://reviews.llvm.org/D153996