ed299b3efd
- Remove some cases where ULEB128 isn't needed - Add a fastDecodeULEB128 tailored for GlobalISel which does unchecked decoding optimized for the common case, which is 1 byte values. We rarely have >1 byte Inst IDs, OpIdx, etc. and those are the most common ULEB users by far. This specific LEB128 decode function generates almost 2x less instructions than the generic one.