[llvm-branch-commits] [BOLT][NFCI] Allow non-simple functions to be in disassembled state (PR #90806)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/90806

BOLTed binaries have no relocations, thus all split functions are marked
as non-simple (BinaryContext::registerFragment). In turn, this prevents
them from being disassembled. Relax the restriction to allow instruction
lookups.

Test Plan: NFC