Fix binutils enumeration test.
Fix binutils enumeration test.

Previous modification broke binutils enumeration test because
it had no support for a case where operand comes not from mod_rm.

TEST=make check-decoder
Review URL: https://chromiumcodereview.appspot.com/10828131

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@9354 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client