Removing a CHECK that is about to go wrong.

I'm about to commit a patch for:
http://reviews.llvm.org/D8567

That patch will break this one existing test case in Clang.
I'm not sure if this file is intending to create a Clang
dependency on the LLVM IR optimizer, but that's the
consequence of specifying -O3 on this test file.

My hope is to avoid buildbot rage by removing this check,
committing the LLVM patch, and then fixing this check.
I don't know how to make a simultaneous commit to Clang
and LLVM.

I will commit the correct CHECK line fix for this test 
shortly.

llvm-svn: 233109