Enable ARM target in GDB
Enable ARM target in GDB

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3102
TEST=toolchain trybots

Review URL: https://codereview.chromium.org/11280304

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10459 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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