[XRay] Write the TSC along with CPUID

Fixes builds in non-little-endian systems.

This is a follow-up to D51911.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341909 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed