[orc-rt] Simplify bit.h countl_zero and bit_width - #225547
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The old countl_zero algorithm wasn't recognized / optimized by clang on arm64 or x86-64. Switch to a simpler loop that clang recognizes and rewrite bit_width in terms of countl_zero. NFCI.
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The old countl_zero algorithm wasn't recognized / optimized by clang on arm64 or x86-64. Switch to a simpler loop that clang recognizes and rewrite bit_width in terms of countl_zero. NFCI.