[llvm-branch-commits] [BOLT][BAT] Fix encoded NumBasicBlocks (PR #87830)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/87830

Emit the recorded number of blocks, not the number of basic block
hashes. There might be differences in corner cases (openssl
BN_BLINDING_convert_ex function).

Test Plan:
Updated openssl.test in https://github.com/rafaelauler/bolt-tests/pull/31