Fix a few tests that were missing ':' on CHECK lines and weren't testing anything.

Found by `git grep '\/\/ CHECK-[^: ]* ' clang/test/ | grep -v RUN:`.

Also tweak CodeGenCXX/arm-swiftcall.cpp to still pass now that it checks more.

Differential Revision: https://reviews.llvm.org/D58061


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@353744 91177308-0d34-0410-b5e6-96231b3b80d8