Move ClassReplacements.cpp test from clang-rename tests to the

clang-apply-replacements tests

The ClassReplacements.cpp test in the clang-rename tests uses
clang-apply-replacements. I moved it back to the clang-tools-extra repository
for now to ensure that the clang-rename tests can pass when clang is compiled
without clang-tools-extra.

llvm-svn: 306843