Implement dummy_id for NaCl architecture because we need to sandbox frame pointer.

This function describes stack frames created by gdb in order to call user functions.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2990
TEST= none

R=eaeltsin@google.com,khim@google.com

Review URL: https://chromiumcodereview.appspot.com/10897005
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