[PATCH] x86: Check if CPUID_INDEX_7_ECX_1 is supported first

[H.J. Lu]

Since bits 31 - 00 in EAX from CPUID with EAX == 7 and ECX == 0 reports
the maximum input value for supported leaf 7 sub-leaves for CPUID with
EAX == 7, check it before invoking CPUID with EAX == 7 and ECX == 1.
This fixes BZ #34565.

-- 
H.J.
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