patch that caused regression PR c++/9167

patch that caused regression PR c++/9167

[Janis Johnson]

The regression reported in PR c++/9167 showed up starting
with this patch:

2002-12-04  Jason Merrill  <jason@redhat.com>

	PR c++/8461, c++/8625
	* integrate.c (copy_decl_for_inlining): Handle explicit invisible
	references.
	* tree-inline.c (initialize_inlined_parameters): Likewise.

	* tree.c (variably_modified_type_p): Just return an error_mark_node.

cp/:

	PR c++/8674
	* call.c (build_over_call): Check specifically for TARGET_EXPR
	when eliding.

	PR c++/8461, c++/8625
	* call.c (convert_for_arg_passing): Don't mess with error_mark_node.
	(cp_convert_parm_for_inlining): Remove.
	* cp-lang.c (LANG_HOOKS_TREE_INLINING_CONVERT_PARM_FOR_INLINING):
	Remove.
	* cp-tree.h (ADDR_IS_INVISIREF): Remove.
	* except.c (stabilize_throw_expr): Remove ADDR_IS_INVISIREF code.

Here's a small test case that causes the compiler to ICE when compiled
on i686-linux with the mainline or 3.3 branch with -O:

-------------------
// ICE when compiled with -O

class A {
private:
const int n;
public:
  A(const int n_) : n(n_) { }
  A(const A& x) : n(x.n) { }
  ~A() { }
  A operator^(A) const {
    A result(n);
    return result;
  }
  A& operator=(const A) {
    return *this;
  }

};


void f(void)
{
  A a_1(16);
  a_1 = a_1 ^ a_1;
}
-------------------

Output from the compiler (mainline from 2002-12-20)

9167.C: In function `void f()':
9167.C:10: internal compiler error: in simplify_gen_subreg, at simplify-rtx.c:
   2629
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

I've added this information to the PR.

Janis