[llvm-branch-commits] [BOLT] Encode landing pads in BAT (PR #114602)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/114602

Reuse secondary entry points vector and include landing pad offsets.
Use LSB to encode LPENTRY bit, similar to BRANCHENTRY bit used to
distinguish branch and block entries in the address map.

Test Plan: updated bolt-address-translation.test