Revert "[XRay][Arm] Enable back XRay testing on Arm32 and fix the failing tests"

This reverts commit r292211, as it broke the Thumb buldbot with:

clang-5.0: error: the clang compiler does not support '-fxray-instrument
on thumbv7-unknown-linux-gnueabihf'

llvm-svn: 292356
2 files changed