[Bug python/17152] when python pretty printer is used watch command prints new value in the old value filed

["skwllsp at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17152

--- Comment #3 from Sergey Kurenkov <skwllsp at gmail dot com> ---
What is expected for the test program is to see in gdb initial value (0,0,0,0,)
in the field "Old value =". In this test the initial value is printed right
after start of the program:

$ gdb -q -x my_uchar4_printer.py  -ex "set pagination off" -ex "start" -ex
"watch value" -ex "print value"  -ex "c"  ./change_uchar_array4
Reading symbols from ./change_uchar_array4...done.
Temporary breakpoint 1 at 0x4005a8: file change_uchar_array4.cpp, line 7.
Starting program: /home/change_uchar_array4

Temporary breakpoint 1, main () at change_uchar_array4.cpp:7
7         memcpy(value, "He",2);
Hardware watchpoint 2: value
$1 = (0,0,0,0,)
Continuing.
Hardware watchpoint 2: value

Old value = (72,101,0,0,)
New value = (72,101,0,0,)
0x0000003a1d889974 in memcpy () from /lib64/libc.so.6

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