828261ebb8
Fixes https://github.com/llvm/llvm-project/issues/174369 - Added a G_CTLS opcode and some pattern matching. This is the GlobalISel equivalent to https://github.com/llvm/llvm-project/pull/173417 - Add legalization for aarch64 and riscv ``` // Folds (ctlz (xor x, (sra x, bitwidth-1))) -> (add (ctls x), 1). // Folds (ctlz (or (shl (xor x, (sra x, bitwidth-1)), 1), 1) -> (ctls x) (clang aarch64) ```
