Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
(stack_check_probe_2, stack_check_probe_loop_1)
(stack_check_probe_loop_2): New functions.
(main): Add call to these new functions.
* gdb.arch/powerpc-aix-prologue.exp: When breaking on these
functions, check that the breakpoint is inserted at the appropriate
location.
(insert_breakpoint): Slightly refine this procedure so that it can
be called several times in the test.