Create a common subclass for arrays

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 3f3f31acca14e11962ff01caa41fb80540cf4206..bbdfb3c1f7f0589ecbe44f1c7ac76fcacb4d4bff 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1378,17 +1378,10 @@ void LCodeGen::DoJSArrayLength(LJSArrayLength* instr) {
 }
 
 
-void LCodeGen::DoExternalArrayLength(LExternalArrayLength* instr) {
+void LCodeGen::DoFixedArrayBaseLength(LFixedArrayBaseLength* instr) {
   Register result = ToRegister(instr->result());
   Register array = ToRegister(instr->InputAt(0));
-  __ ldr(result, FieldMemOperand(array, ExternalArray::kLengthOffset));
-}
-
-
-void LCodeGen::DoFixedArrayLength(LFixedArrayLength* instr) {
-  Register result = ToRegister(instr->result());
-  Register array = ToRegister(instr->InputAt(0));
-  __ ldr(result, FieldMemOperand(array, FixedArray::kLengthOffset));
+  __ ldr(result, FieldMemOperand(array, FixedArrayBase::kLengthOffset));
 }