Use idiomatic CLZ implementation #582
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This PR replaces the previous implementation of
clz32in the reference softfloat library, which had multiple paths and compiler-specific intrinsics or inline assembly for some architectures, with a simpler idiomatic pure C implementation.Modern compilers recognize this implementation and will optimize into a native CLZ instruction on most architectures. Tested on Clang 18 and GCC 16 for AArch64 and x86-64.