[BOLT] Embed cold mapping info into function entry in BAT (#76903)

Reduces BAT section size:
- large binary: to 12283500 bytes (0.32x original size),
- medium binary: to 1616020 bytes (0.27x original size),
- small binary: to 404 bytes (0.28x original size).

Test Plan: Updated bolt/test/X86/bolt-address-translation.test