Fix unused variable warnings.

TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/238543008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20797 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-disasm-ia32.cc

@@ -464,6 +464,7 @@ TEST(DisasmIa320) {
   assm.GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+  USE(code);
 #ifdef OBJECT_PRINT
   code->Print();
   byte* begin = code->instruction_start();

test/cctest/test-disasm-x64.cc

@@ -433,6 +433,7 @@ TEST(DisasmX64) {
   assm.GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+  USE(code);
 #ifdef OBJECT_PRINT
   code->Print();
   byte* begin = code->instruction_start();