[llvm-branch-commits] [BOLT] Zero initialize pre-aggregated counters (PR #142698)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/142698

pre-aggregated traces. Fix by zero initializing both counters.

Test Plan: updated entry-point-fallthru.s