Remove HType::HeapNumber from mutable heap numbers.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 8e0858dca7ea91be64f320d0f83392c592cbf8d9..d6fe8df5454a61489c437b5edadb0a0e7b3b6a92 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -5446,7 +5446,6 @@ HInstruction* HOptimizedGraphBuilder::BuildLoadNamedField(
     checked_object = Add<HLoadNamedField>(
         checked_object, static_cast<HValue*>(NULL),
         access.WithRepresentation(Representation::Tagged()));
-    checked_object->set_type(HType::HeapNumber());
     // Load the double value from it.
     access = HObjectAccess::ForHeapNumberValue();
   }
@@ -5486,7 +5485,7 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
           isolate()->heap()->GetPretenureMode() : NOT_TENURED;
 
       HInstruction* heap_number = Add<HAllocate>(heap_number_size,
-          HType::HeapNumber(),
+          HType::Tagged(),

[Michael Starzinger, 2014/05/26 17:38:09]

nit: Maybe add a short comment why this is not HType::HeapNumber here.

           pretenure_flag,
           HEAP_NUMBER_TYPE);
       AddStoreMapConstant(heap_number, isolate()->factory()->heap_number_map());
@@ -5499,7 +5498,6 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
       // Already holds a HeapNumber; load the box and write its value field.
       HInstruction* heap_number = Add<HLoadNamedField>(
           checked_object, static_cast<HValue*>(NULL), heap_number_access);
-      heap_number->set_type(HType::HeapNumber());
       instr = New<HStoreNamedField>(heap_number,
                                     HObjectAccess::ForHeapNumberValue(),
                                     value, STORE_TO_INITIALIZED_ENTRY);