[patch c++]: Fix PR c++/64106 ICE on valid code

[Kai Tietz]

Hi,

this patch adds INDIRECT_REF support to cxx_eval_store_expression handling.
There is a different variant suggested by Marek, which adds additional
operand-0 to ref, which looks to me wrong.

ChangeLog gcc/cp

2014-12-04  Kai Tietz  <kti...@redhat.com>

    PR c++/64106
    * constexpr.c (cxx_eval_store_expression): Handle INDIRECT_REF.

ChangeLog testsuite

2014-12-04  Kai Tietz  <kti...@redhat.com>

    PR c++/64106
    * g++.dg/pr64106.C: New file.

Tested on x86_64-unknown-linux-gnu.

Ok for apply?

Regards,
Kai

Index: constexpr.c
===================================================================
--- constexpr.c (Revision 218142)
+++ constexpr.c (Arbeitskopie)
@@ -2486,7 +2550,9 @@ cxx_eval_store_expression (const constexpr_ctx *ct
          vec_safe_push (refs, TREE_TYPE (probe));
          probe = TREE_OPERAND (probe, 0);
          break;
-
+       case INDIRECT_REF:
+         probe = TREE_OPERAND (probe, 0);
+         break;
        default:
          object = probe;
          gcc_assert (DECL_P (object));
Index: gcc/gcc/testsuite/g++.dg/pr64106.C
===================================================================
--- /dev/null
+++ gcc/gcc/testsuite/g++.dg/pr64106.C
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+
+void
+f (long &c, int &lc, char *&out)
+{
+  while (lc >= 8) *out++ = (c >> (lc -= 8));
+}