Fix HInnerAllocatedObject to use an HValue for the offset.

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 4e1cc2f7a58bce915542263d8f182b8058f34463..a89d5d9c88428c0b8c1207b94ff821364c723686 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4170,7 +4170,13 @@ void LCodeGen::DoStoreCodeEntry(LStoreCodeEntry* instr) {
 void LCodeGen::DoInnerAllocatedObject(LInnerAllocatedObject* instr) {
   Register result = ToRegister(instr->result());
   Register base = ToRegister(instr->base_object());
-  __ add(result, base, Operand(instr->offset()));
+  if (instr->offset()->IsConstantOperand()) {
+    LConstantOperand* offset = LConstantOperand::cast(instr->offset());
+    __ add(result, base, Operand(ToInteger32(offset)));
+  } else {
+    Register offset = ToRegister(instr->offset());
+    __ add(result, base, offset);
+  }
 }