ARM/ARM64: Optimise HLoadNamedField and HStoreNamedField.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index f852f3de712c45112b351d424c9078e2a1cab2c6..776b55edc3a9a99a26a38e0c1f67f0248ebf350a 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -3054,11 +3054,16 @@ void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
   }
 
   Register result = ToRegister(instr->result());
+  Register source = object;
   if (!access.IsInobject()) {
-    __ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
-    object = result;
+    if (instr->object_properties()) {
+      source = ToRegister(instr->object_properties());
+    } else {
+      __ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
+      source = result;
+    }
   }
-  MemOperand operand = FieldMemOperand(object, offset);
+  MemOperand operand = FieldMemOperand(source, offset);
   __ Load(result, operand, access.representation());
 }
 
@@ -4110,7 +4115,13 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
                           instr->hydrogen()->PointersToHereCheckForValue());
     }
   } else {
-    __ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
+    Register destination;
+    if (instr->object_properties()) {
+      destination = ToRegister(instr->object_properties());
+    } else {
+      __ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
+      destination = scratch;
+    }
     MemOperand operand = FieldMemOperand(scratch, offset);
     __ Store(value, operand, representation);
     if (instr->hydrogen()->NeedsWriteBarrier()) {