[compiler-rt][X86] Use functions in cpuid.h instead of inline assembly (#97877) This patch makes the host/feature detection in compiler-rt and LLVM use the functions provided in cpuid.h(__get_cpuid, __get_cpuid_count) instead of inline assembly. This simplifies the implementation and moves any inline assembly away to a more common place. A while ago, some similar cleanup was attempted, but this ended up resulting in some compilation errors due to toolchain minimum version issues (https://bugs.llvm.org/show_bug.cgi?id=30384). After the reversion landed, there have been no attempts since then to clean up the code, even though the minimum supported compilers now support the relevant functions (https://godbolt.org/z/o1Mjz8ndv).
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