Backport !3753 “gobject_gdb.py: Do not break bt on optimized build” to glib-2-78
Symptom: 20 0x00007ffff756337b in gtk_widget_size_allocate_with_baseline (widget=0xd7a0c0 [DirectWindow], allocation=, baseline=) at gdb.error: value has been optimized out
Trivial backport of !3753 (merged) to glib-2-78
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