[clang-apply-replacements] Make clang-apply-replacements installable

Add a new target for install: install-clang-apply-replacements.
So if you need clang-tidy and clang-apply-replacements tools only, 
you may build and install only these tools:

    make install-clang-tidy install-clang-apply-replacements

Differential Revision: https://reviews.llvm.org/D45160

llvm-svn: 330509

clang-tools-extra/clang-apply-replacements/tool/CMakeLists.txt

@@ -2,7 +2,7 @@ set(LLVM_LINK_COMPONENTS
   Support
   )
 
-add_clang_executable(clang-apply-replacements
+add_clang_tool(clang-apply-replacements
   ClangApplyReplacementsMain.cpp
   )
 target_link_libraries(clang-apply-replacements