[clang-tidy] Lift common matchers to utils namespace

Summary:
This patch is lifting matchers used by more than one checkers
to the common namespace.

Reviewers: aaron.ballman, alexfh

Subscribers: aaron.ballman, cfe-commits

Differential Revision: http://reviews.llvm.org/D19841

llvm-svn: 269804

1 files changed, 5 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/utils/Matchers.h b/clang-tools-extra/clang-tidy/utils/Matchers.h
index 70a68d7fa98..1f3f6dfd57f 100644
--- a/clang-tools-extra/clang-tidy/utils/Matchers.h
+++ b/clang-tools-extra/clang-tidy/utils/Matchers.h
@@ -17,6 +17,11 @@ namespace clang {
 namespace tidy {
 namespace matchers {
 
+AST_MATCHER_P(Expr, ignoringImplicit,
+              ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
+  return InnerMatcher.matches(*Node.IgnoreImplicit(), Finder, Builder);
+}
+
 AST_MATCHER(BinaryOperator, isRelationalOperator) {
   return Node.isRelationalOp();
 }