MIPS: Implement structural function and array types

Port r20817 (e7a84c1)

Original commit message:
Just wanted to add two constructors to a datatype, how ugly can it get?

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/240463004

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20822 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/stub-cache-mips.cc

@@ -417,7 +417,7 @@ void StoreStubCompiler::GenerateStoreTransition(MacroAssembler* masm,
   } else if (representation.IsHeapObject()) {
     HeapType* field_type = descriptors->GetFieldType(descriptor);
     if (field_type->IsClass()) {
-      __ CheckMap(value_reg, scratch1, field_type->AsClass(),
+      __ CheckMap(value_reg, scratch1, field_type->AsClass()->Map(),
                   miss_label, DO_SMI_CHECK);
     } else {
       ASSERT(HeapType::Any()->Is(field_type));
@@ -587,7 +587,7 @@ void StoreStubCompiler::GenerateStoreField(MacroAssembler* masm,
   } else if (representation.IsHeapObject()) {
     HeapType* field_type = lookup->GetFieldType();
     if (field_type->IsClass()) {
-      __ CheckMap(value_reg, scratch1, field_type->AsClass(),
+      __ CheckMap(value_reg, scratch1, field_type->AsClass()->Map(),
                   miss_label, DO_SMI_CHECK);
     } else {
       ASSERT(HeapType::Any()->Is(field_type));
@@ -838,7 +838,9 @@ Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
   int depth = 0;
 
   Handle<JSObject> current = Handle<JSObject>::null();
-  if (type->IsConstant()) current = Handle<JSObject>::cast(type->AsConstant());
+  if (type->IsConstant()) {
+    current = Handle<JSObject>::cast(type->AsConstant()->Value());
+  }
   Handle<JSObject> prototype = Handle<JSObject>::null();
   Handle<Map> current_map = receiver_map;
   Handle<Map> holder_map(holder->map());