[llvm-branch-commits] [TargetParser][AArch64][NFC] Reference ArchInfo via index (PR #206699)

[Alexis Engelke via llvm-branch-commits]

https://github.com/aengelke created https://github.com/llvm/llvm-project/pull/206699

This removes all relocations from CpuInfos so that the 3-4 kiB structure
can be stored in .rodata. Additionally, the ArchInfos pointer array is
replaced by an ArchInfos value array and the architecture names are
replaced by constexpr references.