Adds native/leaf runtime call stub and redirection on MIPS.

runtime/vm/stub_code_mips_test.cc

Index: runtime/vm/stub_code_mips_test.cc
===================================================================
--- runtime/vm/stub_code_mips_test.cc	(revision 20788)
+++ runtime/vm/stub_code_mips_test.cc	(working copy)
@@ -39,7 +39,23 @@
 // Test calls to stub code which calls into the runtime.
 static void GenerateCallToCallRuntimeStub(Assembler* assembler,
                                           int value1, int value2) {
-  UNIMPLEMENTED();
+  const int argc = 2;
+  const Smi& smi1 = Smi::ZoneHandle(Smi::New(value1));
+  const Smi& smi2 = Smi::ZoneHandle(Smi::New(value2));
+  const Object& result = Object::ZoneHandle();
+  const Context& context = Context::ZoneHandle(Context::New(0, Heap::kOld));
+  ASSERT(context.isolate() == Isolate::Current());
+  __ EnterDartFrame(0);
+  __ LoadObject(CTX, context);
+  __ PushObject(result);  // Push Null object for return value.
+  __ PushObject(smi1);  // Push argument 1 smi1.
+  __ PushObject(smi2);  // Push argument 2 smi2.
+  ASSERT(kTestSmiSubRuntimeEntry.argument_count() == argc);
+  __ CallRuntime(kTestSmiSubRuntimeEntry);  // Call SmiSub runtime func.
+  __ addiu(SP, SP, Immediate(argc * kWordSize));
+  __ Pop(V0);  // Pop return value from return slot.
+  __ LeaveDartFrame();
+  __ Ret();
 }
 
 
@@ -64,7 +80,15 @@
 static void GenerateCallToCallLeafRuntimeStub(Assembler* assembler,
                                               int value1,
                                               int value2) {
-  UNIMPLEMENTED();
+  const Smi& smi1 = Smi::ZoneHandle(Smi::New(value1));
+  const Smi& smi2 = Smi::ZoneHandle(Smi::New(value2));
+  __ EnterDartFrame(0);
+  __ ReserveAlignedFrameSpace(0);
+  __ LoadObject(A0, smi1);  // Set up argument 1 smi1.
+  __ LoadObject(A1, smi2);  // Set up argument 2 smi2.
+  __ CallRuntime(kTestLeafSmiAddRuntimeEntry);  // Call SmiAdd runtime func.
+  __ LeaveDartFrame();
+  __ Ret();  // Return value is in R0.
 }