[AMDGPU][SIFoldOperands] Fold some redundant bitmasks#131311

Pierre-vh wants to merge 2 commits intousers/pierre-vh/precommit_bitmask_testllvm/llvm-project:users/pierre-vh/precommit_bitmask_testfrom

users/pierre-vh/sifold-bitmasksllvm/llvm-project:users/pierre-vh/sifold-bitmasksCopy head branch name to clipboard