Update the way llvm2cpp tests are done:
1. Make sure bytecode/assembly inputs are always redirected stdin so that
the module name is <stdin>. This helps not get false negatives when the
diff is done.
2. Scan the test file to determine if llvm-upgrade needs to be run.
3. Avoid running testings that are XFAIL'd because they'll cause a failure
when run for llvm2cpp.
4. Get some better error message output.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35914
91177308-0d34-0410-b5e6-
96231b3b80d8