5e32765c15
This is based on ideas from @nafi to: - use a branchless version of 'cmp' for 'uint32_t', - completely resolve the lexicographic comparison through vector operations when wide types are available. We also get rid of byte reloads and serializing '__builtin_ctzll'. I did not include the suggestion to replace comparisons of 'uint16_t' with two 'uint8_t' as it did not seem to help the codegen. This can be revisited in sub-sequent patches. The code been rewritten to reduce nested function calls, making the job of the inliner easier and preventing harmful code duplication. Reviewed By: nafi3000 Differential Revision: https://reviews.llvm.org/D148717
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