Fix jump function update in inliner

[Jan Hubicka]

Hi,
this patch fixes the problem with clearing bits and m_vr in inliner
update we discussed earlier.  I am not sure if
dete_type_change_from_memory_writes needs the clear?

Bootstrapped/regtested x86_64-linux, Martin, does it make sense?

Honza

        * ipa-prop.c (ipa_set_jf_unknown): Do not clear bits and m_vr.
        (detect_type_change_from_memory_writes): Clear it here.
Index: ipa-prop.c
===================================================================
--- ipa-prop.c  (revision 278877)
+++ ipa-prop.c  (working copy)
@@ -512,8 +512,6 @@ static void
 ipa_set_jf_unknown (struct ipa_jump_func *jfunc)
 {
   jfunc->type = IPA_JF_UNKNOWN;
-  jfunc->bits = NULL;
-  jfunc->m_vr = NULL;
 }
 
 /* Set JFUNC to be a copy of another jmp (to be used by jump function
@@ -819,6 +817,8 @@ detect_type_change_from_memory_writes (i
     return false;
 
   ipa_set_jf_unknown (jfunc);
+  jfunc->bits = NULL;
+  jfunc->m_vr = NULL;
   return true;
 }