Revert "[compiler-rt][Profile] Disable test on Arm/AArch64 Linux"

This reverts commit 8b86f8a325.

The inconsistent behaviour has been fixed with
5e50d3073a.

compiler-rt/test/profile/ContinuousSyncMode/set-file-object.c

@@ -1,8 +1,5 @@
 // REQUIRES: darwin || linux
 
-// Disabled due to flaky results
-// UNSUPPORTED: arm-linux,armhf-linux,aarch64-linux
-
 // Test using __llvm_profile_set_file_object in continuous mode (%c).
 // Create & cd into a temporary directory.
 // RUN: rm -rf %t.dir && mkdir -p %t.dir && cd %t.dir