Fix test case to be portable to different architectures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218134 91177308-0d34-0410-b5e6-96231b3b80d8
Revert my earlier change to add "all" as a dependency to check. In
retrospect it really wasn't a good idea.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218136 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-cov: Prevent a test from matching its own check lines

Since llvm-cov shows the source file in its output, be careful about
potentially matching the check lines themselves.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218138 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-cov: Return unique_ptrs instead of filling objects (NFC)

Having create* functions return the object they create is more
readable than using an in-out parameter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218139 91177308-0d34-0410-b5e6-96231b3b80d8