Teach TurboFan to call C functions with result_size > 1.

src/compiler/js-graph.cc

Index: src/compiler/js-graph.cc
diff --git a/src/compiler/js-graph.cc b/src/compiler/js-graph.cc
index da6d66df627691c9c22d2f8a85b679a06266f6d7..b8a7f976e82ce6e4a91726ea7faff57dc87a4b6b 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -17,12 +17,16 @@ Node* JSGraph::ImmovableHeapConstant(Handle<HeapObject> object) {
 }
 
 
-Node* JSGraph::CEntryStubConstant() {
-  if (!c_entry_stub_constant_.is_set()) {
-    c_entry_stub_constant_.set(
-        ImmovableHeapConstant(CEntryStub(isolate(), 1).GetCode()));
+Node* JSGraph::CEntryStubConstant(int result_size) {
+  if (result_size == 1) {
+    if (!c_entry_stub_constant_.is_set()) {
+      c_entry_stub_constant_.set(
+          ImmovableHeapConstant(CEntryStub(isolate(), 1).GetCode()));
+    }
+    return c_entry_stub_constant_.get();
   }
-  return c_entry_stub_constant_.get();
+
+  return ImmovableHeapConstant(CEntryStub(isolate(), result_size).GetCode());
 }