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[XRay][AArch64] An attempt to fix test patching-unpatching.cc by flushing the…

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[XRay][AArch64] An attempt to fix test patching-unpatching.cc by flushing the instruction cache after code modification

Summary: This patch attempts to fix test patching-unpatching.cc . The new code flushes the instruction cache after modifying the program at runtime.

Reviewers: dberris, rengolin, pelikan, rovka

Subscribers: rovka, llvm-commits, iid_iunknown, aemerson

Differential Revision: https://reviews.llvm.org/D27996

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