llvm-cov: Fix a misuse of ArrayRef::slice I introduced in r217430

It appears this code was completely untested, so using ArrayRef wrong
didn't break anything obvious.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217476 91177308-0d34-0410-b5e6-96231b3b80d8
[MIPS] Add aliases for sync instruction used by Octeon CPU

This commit adds aliases for the sync instruction (synciobdma,
syncs, syncw, syncws) which are used by the Octeon CPU.

Reviewed by D. Sanders

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217477 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-cov: Remove an overly system specific test

It appears that the -filename-equivalence option for testing llvm-cov
doesn't work correctly with -show-expansions. I'm reverting this test
to get the bots green while I look into fixing that.

This partially reverts r217476

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217478 91177308-0d34-0410-b5e6-96231b3b80d8