[turbofan] Add support for pushing returns into merges.

test/unittests/compiler/node-test-utils.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/unittests/compiler/node-test-utils.h"
 
 #include <vector>
 
 #include "src/assembler.h"
 #include "src/compiler/js-operator.h"
@@ skipping 1377 matching lines @@
 }
 
 
 Matcher<Node*> IsEnd(const Matcher<Node*>& control0_matcher,
                      const Matcher<Node*>& control1_matcher) {
   return MakeMatcher(new IsControl2Matcher(IrOpcode::kEnd, control0_matcher,
                                            control1_matcher));
 }
 
 
+Matcher<Node*> IsEnd(const Matcher<Node*>& control0_matcher,
+                     const Matcher<Node*>& control1_matcher,
+                     const Matcher<Node*>& control2_matcher) {
+  return MakeMatcher(new IsControl3Matcher(IrOpcode::kEnd, control0_matcher,
+                                           control1_matcher, control2_matcher));
+}
+
+
 Matcher<Node*> IsBranch(const Matcher<Node*>& value_matcher,
                         const Matcher<Node*>& control_matcher) {
   return MakeMatcher(new IsBranchMatcher(value_matcher, control_matcher));
 }
 
 
 Matcher<Node*> IsMerge(const Matcher<Node*>& control0_matcher,
                        const Matcher<Node*>& control1_matcher) {
   return MakeMatcher(new IsControl2Matcher(IrOpcode::kMerge, control0_matcher,
                                            control1_matcher));
@@ skipping 446 matching lines @@
 IS_UNOP_MATCHER(NumberToInt32)
 IS_UNOP_MATCHER(NumberToUint32)
 IS_UNOP_MATCHER(ObjectIsSmi)
 IS_UNOP_MATCHER(ObjectIsNonNegativeSmi)
 IS_UNOP_MATCHER(Word32Clz)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8