[Bug target/65836] [6 Regression] gnat fails to build on aarch64-linux-gnu

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65836

--- Comment #4 from ktkachov at gcc dot gnu.org ---
Bisection confirmed that it's r222173:
Author: vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Fri Apr 17 09:26:59 2015 +0000

    Postpone expanding va_arg until pass_stdarg

    2015-04-17  Tom de Vries  <t...@codesourcery.com>
            Michael Matz  <m...@suse.de>


I'll try updating my tree to r222318
Author: vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Apr 22 09:03:01 2015 +0000

    Fix va_arg ap_copy nop detection

    2015-04-22  Tom de Vries  <t...@codesourcery.com>

        PR tree-optimization/65823
        * gimplify.c (gimplify_modify_expr): Use operand_equal_p to test for
        equality between ap_copy and ap.

and see if that fixes it