Implemented clang-tidy-check-specific options.

Summary:
Each check can implement readOptions and storeOptions methods to read
and store custom options. Each check's options are stored in a local namespace
to avoid name collisions and provide some sort of context to the user.

Reviewers: bkramer, klimek

Reviewed By: klimek

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D5296

llvm-svn: 217661

clang-tools-extra/unittests/clang-tidy/LLVMModuleTest.cpp

@@ -95,6 +95,8 @@ static std::string runHeaderGuardCheck(StringRef Code, const Twine &Filename) {
 
 namespace {
 struct WithEndifComment : public LLVMHeaderGuardCheck {
+  WithEndifComment(StringRef Name, ClangTidyContext *Context)
+      : LLVMHeaderGuardCheck(Name, Context) {}
   bool shouldSuggestEndifComment(StringRef Filename) override { return true; }
 };
 } // namespace