[Profile] The test for gcov-fork seems to be ok on arm

Summary: Remove the XFAIL for arm since it seems to be ok

Reviewers: marco-c

Reviewed By: marco-c

Subscribers: javed.absar, kristof.beyls, delcypher, chrib, llvm-commits, #sanitizers, sylvestre.ledru

Differential Revision: https://reviews.llvm.org/D54263

llvm-svn: 346409