Support using CPUID instruction for TSC frequency when available
Intel has introduced CPUID leaf 0x15 which returns the following (on supported platforms):
EAX = numerator of TSC frequency / core crystal clock frequency
EBX = denominator of TSC frequency / core crystal clock frequency (if != 0)
ECX = core crystal clock frequency (in Hz, as an unsigned int)
When the CPUID instruction indicates support for this leaf, and the resulting values are non-zero, this can be used to determine the TSC frequency.
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