Rename a few unittests/.../Foo.cpp files to FooTest.cpp

The convention for unit test sources is that they're called FooTest.cpp.

No behavior change.
https://reviews.llvm.org/D51579


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341313 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed