[Sparc] limit MaxAtomicSizeInBitsSupported to 32 for 32-bit Sparc. (#81655)#81713

brad0 wants to merge 1 commit intollvm:release/18.xllvm/llvm-project:release/18.xfrom

brad0:18_sparc_atomicbrad0/llvm-project:18_sparc_atomicCopy head branch name to clipboard