[PATCH, bootstrap]: Initialize deref_align in ipa_modify_call_arguments to fix profiledbootstrap

[Uros Bizjak]

Hello!

It looks that it is too hard for the compiler to track deref_align
initialization through dependent deref_base boolean. The patch bellow
fixes "may be used uninitialized" warning that breaks
profiledbootstrap.

2013-09-07  Uros Bizjak  <ubiz...@gmail.com>

    * ipa-prop.c (ipa_modify_call_arguments): Initialize deref_align.

Tested on x86_64-pc-linux-gnu with LTO profiledbootstrap.

OK for mainline?

Uros.

Index: ipa-prop.c
===================================================================
--- ipa-prop.c  (revision 202352)
+++ ipa-prop.c  (working copy)
@@ -3526,7 +3526,7 @@ ipa_modify_call_arguments (struct cgraph_edge *cs,
        {
          tree expr, base, off;
          location_t loc;
-         unsigned int deref_align;
+         unsigned int deref_align = 0;
          bool deref_base = false;
 
          /* We create a new parameter out of the value of the old one, we can