toolchain/51022: lib/csu/t_crt0/initfini4 test case failing on amd64

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

>Number:         51022
>Category:       toolchain
>Synopsis:       lib/csu/t_crt0/initfini4 test case failing on amd64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 29 17:55:00 +0000 2016
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2016.03.10.14.40.00
>Organization:

>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The lib/csu/t_crt0/initfini4 test case is failing on amd64 
since christos' commit of src/external/gpl3/gcc.old/dist/gcc/varasm.c 1.6
on 2016-03-10 14:40:00 UTC.

The test prints an error message saying "stack unaligned":

  Fail: incorrect exit status: 1, expected: 0
  stdout:
  constructor2 executed
  constructor executed
  main executed
  destructor executed
  destructor2 executed
  stack unaligned 

  stderr:

The initfini3 test has been failing in a similar way for some time
as reported in PR 49236.

>How-To-Repeat:

Run the ATF tests on amd64.

>Fix: