[llvm] [BOLT] Add symbolizer for AArch64 disassembler. NFCI (PR #127969)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

Hi Paschalis,

Thanks for identifying the issues. The first one is caused by a currently limited support for AArch64 relocations in `createRelocation()` function. For this PR, I might have to disable the symbolizer in `scanExternalRefs()` while I work on adding new relocations.

The second issue is caused by LLVM AArch64 disassembler. It does not invoke `tryAddingSymbolicOperand()` for `movz` and `movk` instructions. Will need to dig into why.

https://github.com/llvm/llvm-project/pull/127969