[PATCH] Fix PR78047

[Richard Biener]

I am testing the following to fix another latent PTA bug uncovered
by pointer comparsion folding.

Bootstrap and regtest running on x86_64-unknown-linux-gnu.

Richard.

2016-10-31  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/78047
        * tree-ssa-structalias.c (push_fields_onto_fieldstack): Initialize
        fake field at offset zero conservatively regarding to may_have_pointers.

diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index fb364f1..2880382 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -5566,7 +5568,7 @@ push_fields_onto_fieldstack (tree type, vec<fieldoff_s> 
*fieldstack,
                && offset + foff != 0)
              {
                fieldoff_s e
-                 = {0, offset + foff, false, false, false, false, NULL_TREE};
+                 = {0, offset + foff, false, false, true, false, NULL_TREE};
                pair = fieldstack->safe_push (e);
              }