[X86] Fix RegAlloc issue by implementing TRI::getCustomEHPadPreservedMask#135518

s-barannikov wants to merge 3 commits intollvm:mainllvm/llvm-project:mainfrom

s-barannikov:sjlj/x86-unwind-clobbers-barannikov/llvm-project:sjlj/x86-unwind-clobberCopy head branch name to clipboard