[clang] [llvm] [AArch64] FEAT_SPEv1p2 is optional in v8.7-A and v9.2-A (PR #123336)

[Philipp Tomsich via llvm-commits]

ptomsich wrote:

FEAT_SPE is not supported on Ampere1B, so should be removed from the Ampere1B feature-set.

https://github.com/llvm/llvm-project/pull/123336