[release/18.x][backport][libc++abi] Use __has_feature check to enable usage of thread_local for exception storage#132241

dybv-sc wants to merge 1 commit intollvm:release/18.xllvm/llvm-project:release/18.xfrom

dybv-sc:backport-18.x-tls-fixdybv-sc/llvm-project:backport-18.x-tls-fixCopy head branch name to clipboard