Create a common subclass for arrays

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 07867c70f2fa24463e9875702bbe9a005106099e..1f2ef530adec8899922eba8791e22545ca6cf9c1 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1541,16 +1541,10 @@ LInstruction* LChunkBuilder::DoJSArrayLength(HJSArrayLength* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoFixedArrayLength(HFixedArrayLength* instr) {
+LInstruction* LChunkBuilder::DoFixedArrayBaseLength(
+    HFixedArrayBaseLength* instr) {
   LOperand* array = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new LFixedArrayLength(array));
-}
-
-
-LInstruction* LChunkBuilder::DoExternalArrayLength(
-    HExternalArrayLength* instr) {
-  LOperand* array = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new LExternalArrayLength(array));
+  return DefineAsRegister(new LFixedArrayBaseLength(array));
 }