ARM: Implement delete operation in lithium codegen....

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
===================================================================
--- src/arm/lithium-arm.cc	(revision 6241)
+++ src/arm/lithium-arm.cc	(working copy)
@@ -1829,8 +1829,9 @@
 
 
 LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
-  LInstruction* result = new LDeleteProperty(Use(instr->object()),
-                                             UseOrConstant(instr->key()));
+  LOperand* object = UseRegisterAtStart(instr->object());
+  LOperand* key = UseRegisterAtStart(instr->key());
+  LInstruction* result = new LDeleteProperty(object, key);
   return MarkAsCall(DefineFixed(result, r0), instr);
 }