[AArch64] Make apple-m4 armv8.7-a again (from armv9.2-a). #106312

ahmedbougacha merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

ahmedbougacha:users/ahmedbougacha/aarch64-apple-m4-v8.7aahmedbougacha/llvm-project:users/ahmedbougacha/aarch64-apple-m4-v8.7aCopy head branch name to clipboard