do not register matcher for objc-only checks when analyzing non-objc sources to save resources

[Wizard]

Summary

I did not put lang opt check in AvoidSpinlockCheck since OSSpinLock is not objc specific. We won't want to skip it when analyzing some C++ target used by other ObjC sources.

clang-tools-extra/trunk/clang-tidy/google/AvoidThrowingObjCExceptionCheck.cpp

 using namespace clang::ast_matchers;
 
 namespace clang {
 namespace tidy {
 namespace google {
 namespace objc {
 
 void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {
+  // this check should only be applied to ObjC sources.
+  if (!getLangOpts().ObjC1 && !getLangOpts().ObjC2) {
+    return;
+  }
+
   Finder->addMatcher(objcThrowStmt().bind("throwStmt"), this);
   Finder->addMatcher(
       objcMessageExpr(anyOf(hasSelector("raise:format:"),
                             hasSelector("raise:format:arguments:")),
                       hasReceiverType(asString("NSException")))
           .bind("raiseException"),
       this);
 }

clang-tools-extra/trunk/clang-tidy/objc/AvoidNSErrorInitCheck.cpp

 
 using namespace clang::ast_matchers;
 
 namespace clang {
 namespace tidy {
 namespace objc {
 
 void AvoidNSErrorInitCheck::registerMatchers(MatchFinder *Finder) {
+  // this check should only be applied to ObjC sources.
+  if (!getLangOpts().ObjC1 && !getLangOpts().ObjC2) {
+    return;
+  }
   Finder->addMatcher(objcMessageExpr(hasSelector("init"),
                                      hasReceiverType(asString("NSError *")))
                          .bind("nserrorInit"),
                      this);
 }
 
 void AvoidNSErrorInitCheck::check(const MatchFinder::MatchResult &Result) {
   const auto *MatchedExpr =

clang-tools-extra/trunk/clang-tidy/objc/ForbiddenSubclassingCheck.cpp

ForbiddenSubclassingCheck::ForbiddenSubclassingCheck(
     ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       ForbiddenSuperClassNames(
           utils::options::parseStringList(
               Options.get("ClassNames", DefaultForbiddenSuperClassNames))) {
 }
 
 void ForbiddenSubclassingCheck::registerMatchers(MatchFinder *Finder) {
+  // this check should only be applied to ObjC sources.
+  if (!getLangOpts().ObjC1 && !getLangOpts().ObjC2) {
+    return;
+  }
   Finder->addMatcher(
       objcInterfaceDecl(
           isSubclassOf(
               objcInterfaceDecl(
                   hasAnyName(
                       std::vector<StringRef>(
                           ForbiddenSuperClassNames.begin(),
                           ForbiddenSuperClassNames.end())))

clang-tools-extra/trunk/clang-tidy/objc/PropertyDeclarationCheck.cpp

PropertyDeclarationCheck::PropertyDeclarationCheck(StringRef Name,
                                                    ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       SpecialAcronyms(
           utils::options::parseStringList(Options.get("Acronyms", ""))),
       IncludeDefaultAcronyms(Options.get("IncludeDefaultAcronyms", true)),
       EscapedAcronyms() {}
 
 void PropertyDeclarationCheck::registerMatchers(MatchFinder *Finder) {
+  // this check should only be applied to ObjC sources.
+  if (!getLangOpts().ObjC1 && !getLangOpts().ObjC2) {
+    return;
+  }
   if (IncludeDefaultAcronyms) {
     EscapedAcronyms.reserve(llvm::array_lengthof(DefaultSpecialAcronyms) +
                             SpecialAcronyms.size());
     // No need to regex-escape the default acronyms.
     EscapedAcronyms.insert(EscapedAcronyms.end(),
                            std::begin(DefaultSpecialAcronyms),
                            std::end(DefaultSpecialAcronyms));
   } else {