[turbofan] Add basic support for calling to (a subset of) C functions.

test/unittests/compiler/raw-machine-assembler.cc

Index: test/unittests/compiler/raw-machine-assembler.cc
diff --git a/test/unittests/compiler/raw-machine-assembler.cc b/test/unittests/compiler/raw-machine-assembler.cc
index 20948108aaa4dd17073bd52f4f6a0e5884a7a9a3..5bae30e63e2bd3a16a42d469cc49233e44fd73e8 100644
--- a/test/unittests/compiler/raw-machine-assembler.cc
+++ b/test/unittests/compiler/raw-machine-assembler.cc
@@ -144,6 +144,52 @@ Node* RawMachineAssembler::CallRuntime1(Runtime::FunctionId function,
 }
 
 
+Node* RawMachineAssembler::CallCFunction0(MachineType return_type,
+                                          Node* function) {
+  MachineSignature::Builder builder(zone(), 1, 0);
+  builder.AddReturn(return_type);
+  const CallDescriptor* descriptor =
+      Linkage::GetSimplifiedCDescriptor(zone(), builder.Build());
+
+  Node* call = graph()->NewNode(common()->Call(descriptor), function);
+  schedule()->AddNode(CurrentBlock(), call);
+  return call;
+}
+
+
+Node* RawMachineAssembler::CallCFunction1(MachineType return_type,
+                                          MachineType arg0_type, Node* function,
+                                          Node* arg0) {
+  MachineSignature::Builder builder(zone(), 1, 1);
+  builder.AddReturn(return_type);
+  builder.AddParam(arg0_type);
+  const CallDescriptor* descriptor =
+      Linkage::GetSimplifiedCDescriptor(zone(), builder.Build());
+
+  Node* call = graph()->NewNode(common()->Call(descriptor), function, arg0);
+  schedule()->AddNode(CurrentBlock(), call);
+  return call;
+}
+
+
+Node* RawMachineAssembler::CallCFunction2(MachineType return_type,
+                                          MachineType arg0_type,
+                                          MachineType arg1_type, Node* function,
+                                          Node* arg0, Node* arg1) {
+  MachineSignature::Builder builder(zone(), 1, 2);
+  builder.AddReturn(return_type);
+  builder.AddParam(arg0_type);
+  builder.AddParam(arg1_type);
+  const CallDescriptor* descriptor =
+      Linkage::GetSimplifiedCDescriptor(zone(), builder.Build());
+
+  Node* call =
+      graph()->NewNode(common()->Call(descriptor), function, arg0, arg1);
+  schedule()->AddNode(CurrentBlock(), call);
+  return call;
+}
+
+
 void RawMachineAssembler::Bind(Label* label) {
   DCHECK(current_block_ == NULL);
   DCHECK(!label->bound_);