[BOLT] Free more memory in BinaryFunction::releaseCFG()

Summary:
Free more lists in BinaryFunction::releaseCFG().

Release BinaryFunction::Relocations after disassembly.

Do not populate BinaryFunction::MoveRelocations as we are not using them
currently.

Also remove PCRelativeRelocationOffsets that weren't used.

(cherry picked from FBD18413256)