[commit/testsuite/Ada] Fix random failure in gdb.ada/print_pc.exp (hopefully?)

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

I started realizing yesterday that, once in a while, print_pc.exp fails.
It never failed when I ran the testcase separately, but otherwise fails
occasionally when I run the entire testsuite.

Looking more closely, I think this is because I didn't "swallow" the
output from the call to "gdb_start_cmd", and by failing to do so,
I created the potential for unsynchronizing command and output (a
gdb_test command ends up checking the output from the previous command).

Fixed thusly:

2008-01-08  Joel Brobecker  <brobecker@adacore.com>

        * gdb.ada/print_pc.exp: Add verification of where gdb_start_cmd
        landed.  Should also fix random failures in the test following it.

Tested on x86-linux. Checked in.

-- 
Joel

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