[llvm-branch-commits] [BOLT] Detect .warm split functions as cold fragments (PR #93759)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/93759

CDSplit splits functions up to three ways: main fragment with no suffix,
and fragments with .cold and .warm suffixes.

Add .warm suffix to the regex used to recognize split fragments.

Test Plan: updated register-fragments-bolt-symbols.s