R600/SI: Fix tests with triples in them

Only set the triple from the command line options.
Some of these were still testing SI features and using the
old r600-- triple.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238958 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed