[CUDA] Rename check-prefixes in cuda-options.cu and cuda-unused-arg-warning.cu.
Summary:
Rename the args to be more human-readable. Among other things, this
lets us get rid of a bunch of comments (e.g. "ensure we don't run the
linker"), greatly shortening these tests.
Also apply consistent formatting and fix some English nits while we're
at it.
Reviewers: tra
Differential Revision: http://reviews.llvm.org/D15975
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@257557
91177308-0d34-0410-b5e6-
96231b3b80d8