[llvm-branch-commits] [llvm] [BOLT] Embed cold mapping info into function entry in BAT (PR #76903)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/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