test: remove the archive before modifying it

The archive may already exist when not doing a clean test run.  The dirty state
can cause a test failure.  Remove the archive first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286778 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed