[clang-tidy] Update `TransformerClangTidyCheck` to use new `buildMatchers` functionality.

[ymandel]

Summary

buildMatchers is the new, more general way to extract the matcher from a rule.
This change migrates the code to use it instead of buildMatcher.

clang-tools-extra/trunk/clang-tidy/utils/TransformerClangTidyCheck.cpp

Inserter = llvm::make_unique<IncludeInserter>(
         SM, getLangOpts(), utils::IncludeSorter::IS_LLVM);
     PP->addPPCallbacks(Inserter->CreatePPCallbacks());
   }
 }
 
 void TransformerClangTidyCheck::registerMatchers(
     ast_matchers::MatchFinder *Finder) {
   if (Rule)
-    Finder->addDynamicMatcher(tooling::detail::buildMatcher(*Rule), this);
+    for (auto &Matcher : tooling::detail::buildMatchers(*Rule))
+      Finder->addDynamicMatcher(Matcher, this);
 }
 
 void TransformerClangTidyCheck::check(
     const ast_matchers::MatchFinder::MatchResult &Result) {
   if (Result.Context->getDiagnostics().hasErrorOccurred())
     return;
 
   // Verify the existence and validity of the AST node that roots this rule.