re PR debug/51746 (Segfault in cselib_preserved_value_p)

PR debug/51746
* cselib.c (cselib_hash_rtx): Hash incoming VALUEs too.

From-SVN: r182963

gcc/ChangeLog

+2012-01-06  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/51746
+	* cselib.c (cselib_hash_rtx): Hash incoming VALUEs too.
+
 2012-01-06  Arnaud Charlet  <charlet@adacore.com>
 
 	* c-decl.c (ext_block): Moved up.

gcc/cselib.c

@@ -1020,6 +1020,10 @@ cselib_hash_rtx (rtx x, int create, enum machine_mode memmode)
 
   switch (code)
     {
+    case VALUE:
+      e = CSELIB_VAL_PTR (x);
+      return e->hash;
+
     case MEM:
     case REG:
       e = cselib_lookup (x, GET_MODE (x), create, memmode);