[clang-move] ClangMoveTests: Remove dots in output paths

[simark]

Summary

Following D48903 ([VirtualFileSystem] InMemoryFileSystem::status: Return
a Status with the requested name), the paths output by clang-move in the
FileToReplacements map may contain leading "./". For example, where we
would get "foo.h", we'll now get "./foo.h". This breaks the tests,
because we are doing exact string lookups in the FileToFileID and
Results maps (they contain "foo.h", but we search for "./foo.h").

To mitigate this, try to normalize a little bit the paths output by
clang-move to remove that leading "./".

This patch should be safe to merge before D48903, remove_dots will just
be a no-op.

[hokein]

Looks good.

clang-tools-extra/trunk/unittests/clang-move/ClangMoveTests.cpp

// std::string IncludeArg = Twine("-I" + WorkingDir;
   tooling::runToolOnCodeWithArgs(
       Factory->create(), CC, Context.InMemoryFileSystem,
       {"-std=c++11", "-fparse-all-comments", "-I."}, TestCCName, "clang-move",
       std::make_shared<PCHContainerOperations>());
   formatAndApplyAllReplacements(FileToReplacements, Context.Rewrite, "llvm");
   // The Key is file name, value is the new code after moving the class.
   std::map<std::string, std::string> Results;
   for (const auto &It : FileToReplacements) {
-    StringRef FilePath = It.first;
-    Results[FilePath] = Context.getRewrittenText(FileToFileID[FilePath]);
+    // The path may come out as "./foo.h", normalize to "foo.h".
+    SmallString<32> FilePath (It.first);
+    llvm::sys::path::remove_dots(FilePath);
+    Results[FilePath.str().str()] = Context.getRewrittenText(FileToFileID[FilePath]);
   }
   return Results;
 }
 
 TEST(ClangMove, MoveHeaderAndCC) {
   move::MoveDefinitionSpec Spec;
   Spec.Names = {std::string("a::b::Foo")};
   Spec.OldHeader = "foo.h";