[turbofan] Add Int32AddWithOverflow machine operator.

src/compiler/node.cc

Index: src/compiler/node.cc
diff --git a/src/compiler/node.cc b/src/compiler/node.cc
index 260870fbe81c1ac7d9ac3bc30150e9dbd9d34c69..670c3afbdf364dc144750080396fb4e37bac5ef5 100644
--- a/src/compiler/node.cc
+++ b/src/compiler/node.cc
@@ -4,10 +4,25 @@
 
 #include "src/compiler/node.h"
 
+#include "src/compiler/generic-node-inl.h"
+
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+void Node::CollectProjections(int projection_count, Node** projections) {
+  for (int i = 0; i < projection_count; ++i) projections[i] = NULL;
+  for (UseIter i = uses().begin(); i != uses().end(); ++i) {
+    if ((*i)->opcode() != IrOpcode::kProjection) continue;
+    int32_t index = OpParameter<int32_t>(*i);
+    ASSERT_GE(index, 0);
+    ASSERT_LT(index, projection_count);
+    ASSERT_EQ(NULL, projections[index]);
+    projections[index] = *i;
+  }
+}
+
+
 OStream& operator<<(OStream& os, const Operator& op) { return op.PrintTo(os); }
 
 
@@ -23,6 +38,7 @@ OStream& operator<<(OStream& os, const Node& n) {
   }
   return os;
 }
-}
-}
-}  // namespace v8::internal::compiler
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8