Localize to ARM, the is_broken for some PNaCl gdb tests.
Localize to ARM, the is_broken for some PNaCl gdb tests.

I tried turning on the ARM tests for PNaCl, but they
are still broken unfortunately:
http://chromegw.corp.google.com/i/tryserver.nacl/builders/nacl-arm_hw_opt_panda/builds/4832/steps/scons%20%5Barm%5D%20%5Bsmall_tests%20medium_tests%5D%20%5B%5D/logs/stdio

We can at least turn some of the tests back on for
PNaCl x86-32 and x86-64.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3252
R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/23463026

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12153 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client