MIPS: Implement IC support for Constant Function transitions.

Port r15124 (6b02a945)

BUG=

Review URL: https://codereview.chromium.org/16984002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15133 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/stub-cache-mips.cc

@@ -503,7 +503,12 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
 
   Register storage_reg = name_reg;
 
-  if (FLAG_track_fields && representation.IsSmi()) {
+  if (details.type() == CONSTANT_FUNCTION) {
+    Handle<HeapObject> constant(
+        HeapObject::cast(descriptors->GetValue(descriptor)));
+    __ LoadHeapObject(scratch1, constant);
+    __ Branch(miss_restore_name, ne, value_reg, Operand(scratch1));
+  } else if (FLAG_track_fields && representation.IsSmi()) {
     __ JumpIfNotSmi(value_reg, miss_restore_name);
   } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
     __ JumpIfSmi(value_reg, miss_restore_name);
@@ -560,6 +565,8 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
                       OMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
+  if (details.type() == CONSTANT_FUNCTION) return;
+
   int index = transition->instance_descriptors()->GetFieldIndex(
       transition->LastAdded());