Remove HType::HeapNumber from mutable heap numbers.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/293353004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21516 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.h

@@ -714,7 +714,6 @@ class HValue : public ZoneObject {
     if (r.IsTagged()) {
       HType t = type();
       if (t.IsSmi()) return Representation::Smi();
-      // TODO(mstarzinger): This is not correct for mutable HeapNumbers.
       if (t.IsHeapNumber()) return Representation::Double();
       if (t.IsHeapObject()) return r;
       return Representation::None();
@@ -5547,10 +5546,6 @@ class HAllocate V8_FINAL : public HTemplateInstruction<2> {
       return Representation::Integer32();
     }
   }
-  // TODO(mstarzinger): Workaround until we track mutable HeapNumber types.
-  virtual Representation KnownOptimalRepresentation() V8_OVERRIDE {
-    return representation();
-  }
 
   virtual Handle<Map> GetMonomorphicJSObjectMap() {
     return known_initial_map_;

src/hydrogen.cc

@@ -5443,7 +5443,6 @@ 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();
   }
@@ -5481,7 +5480,7 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
 
       // TODO(hpayer): Allocation site pretenuring support.
       HInstruction* heap_number = Add<HAllocate>(heap_number_size,
-          HType::HeapNumber(),
+          HType::Tagged(),
           NOT_TENURED,
           HEAP_NUMBER_TYPE);
       AddStoreMapConstant(heap_number, isolate()->factory()->heap_number_map());
@@ -5494,7 +5493,6 @@ 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);