bin/54407: usr.bin/gdb/t_regress:pie regression on sparc64

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         54407
>Category:       bin
>Synopsis:       usr.bin/gdb/t_regress:pie regression on sparc64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 25 08:10:00 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2019.05.30.01.19.59
>Organization:

>Environment:
System: NetBSD
Architecture: sparc64
Machine: sparc64
>Description:

The "pie" test case of the usr.bin/gdb/t_regress test program is
failing on sparc64 since late May, starting with christos' gdb
commits of 2019.05.29.22.07.47 through 2019.05.30.01.19.59.

Logs from qemu:

  http://releng.netbsd.org/b5reports/sparc64/commits-2019.05.html#2019.05.30.01.19.59

and from martin's tests on real hardware:

  http://www.netbsd.org/~martin/sparc64-atf/640_atf.html#usr.bin_gdb_t_regress_pie

>How-To-Repeat:

Run the usr.bin/gdb/t_regress test on sparc64.

>Fix: