[PATCH] Separated RecursiveASTVisitorTest into multiple files to prevent the necessity of using /bigobj on MSVC.

[Marek Kurdej]

Well, another reason was to keep it easy to digest in smaller chunks, but yes I didn't mention it even if it is more important.
Can you please land it as I have no write access.
The error on MSVC was annoying though.

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Comment at: unittests/Tooling/TestVisitor.h:234
@@ -233,2 +233,2 @@
 
-#endif /* LLVM_CLANG_TEST_VISITOR_H */
+#endif
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Wrong header guard comment removed.

http://reviews.llvm.org/D5671