[XRay][compiler-rt] Fix rdtscp support check for x86_64

Description

[XRay][compiler-rt] Fix rdtscp support check for x86_64

Follow-up to D29438.

Details

Committed
dberrisOct 10 2017, 5:44 AM
Parents
rL315305: [ARM, Asm] Harden GNU LDRD/STRD aliases against invalid inputs
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