[AArch64] Enable masked load/store for Streaming-SVE with -march=armv8-a+sme#163133

ShikharjQUIC wants to merge 10 commits intollvm:mainllvm/llvm-project:mainfrom

ShikharjQUIC:march_sme_masked_ldstShikharjQUIC/llvm-project:march_sme_masked_ldstCopy head branch name to clipboard