[ARM][AArch64] Make ACLE __clzl/__clzll return unsigned int instead of unsigned long/uint64_t.

Use unsigned long in place of uint32_t for both clz and cls.

As far as I can tell this matches what ACLE defines and what gcc implements.

Noticed while investigating fixing https://github.com/llvm/llvm-project/issues/63113

Reviewed By: tmatheson

Differential Revision: https://reviews.llvm.org/D154910