[builtins] Remove STRING_ADD_LEFT and STRING_ADD_RIGHT builtins.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 3c18ac9066befae055e4a530ddca6793f3f7bd33..9729f59cc9977b924a6e772bf497ac3438126484 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -3214,97 +3214,6 @@ void FullCodeGenerator::EmitIsSimdValue(CallRuntime* expr) {
 }
 
 
-void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
-    CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
-
-  VisitForAccumulatorValue(args->at(0));
-
-  Label materialize_true, materialize_false, skip_lookup;
-  Label* if_true = NULL;
-  Label* if_false = NULL;
-  Label* fall_through = NULL;
-  context()->PrepareTest(&materialize_true, &materialize_false,
-                         &if_true, &if_false, &fall_through);
-
-  __ AssertNotSmi(eax);
-
-  // Check whether this map has already been checked to be safe for default
-  // valueOf.
-  __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
-  __ test_b(FieldOperand(ebx, Map::kBitField2Offset),
-            1 << Map::kStringWrapperSafeForDefaultValueOf);
-  __ j(not_zero, &skip_lookup);
-
-  // Check for fast case object. Return false for slow case objects.
-  __ mov(ecx, FieldOperand(eax, JSObject::kPropertiesOffset));
-  __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset));
-  __ cmp(ecx, isolate()->factory()->hash_table_map());
-  __ j(equal, if_false);
-
-  // Look for valueOf string in the descriptor array, and indicate false if
-  // found. Since we omit an enumeration index check, if it is added via a
-  // transition that shares its descriptor array, this is a false positive.
-  Label entry, loop, done;
-
-  // Skip loop if no descriptors are valid.
-  __ NumberOfOwnDescriptors(ecx, ebx);
-  __ cmp(ecx, 0);
-  __ j(equal, &done);
-
-  __ LoadInstanceDescriptors(ebx, ebx);
-  // ebx: descriptor array.
-  // ecx: valid entries in the descriptor array.
-  // Calculate the end of the descriptor array.
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiTagSize == 1);
-  STATIC_ASSERT(kPointerSize == 4);
-  __ imul(ecx, ecx, DescriptorArray::kDescriptorSize);
-  __ lea(ecx, Operand(ebx, ecx, times_4, DescriptorArray::kFirstOffset));
-  // Calculate location of the first key name.
-  __ add(ebx, Immediate(DescriptorArray::kFirstOffset));
-  // Loop through all the keys in the descriptor array. If one of these is the
-  // internalized string "valueOf" the result is false.
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ mov(edx, FieldOperand(ebx, 0));
-  __ cmp(edx, isolate()->factory()->valueOf_string());
-  __ j(equal, if_false);
-  __ add(ebx, Immediate(DescriptorArray::kDescriptorSize * kPointerSize));
-  __ bind(&entry);
-  __ cmp(ebx, ecx);
-  __ j(not_equal, &loop);
-
-  __ bind(&done);
-
-  // Reload map as register ebx was used as temporary above.
-  __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
-
-  // Set the bit in the map to indicate that there is no local valueOf field.
-  __ or_(FieldOperand(ebx, Map::kBitField2Offset),
-         Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf));
-
-  __ bind(&skip_lookup);
-
-  // If a valueOf property is not found on the object check that its
-  // prototype is the un-modified String prototype. If not result is false.
-  __ mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset));
-  __ JumpIfSmi(ecx, if_false);
-  __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset));
-  __ mov(edx, Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ mov(edx,
-         FieldOperand(edx, GlobalObject::kNativeContextOffset));
-  __ cmp(ecx,
-         ContextOperand(edx,
-                        Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
-  PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
-  Split(equal, if_true, if_false, fall_through);
-
-  context()->Plug(if_true, if_false);
-}
-
-
 void FullCodeGenerator::EmitIsFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);