c++: Fix ICE in reshape_init with init-list [PR95164]

c++: Fix ICE in reshape_init with init-list [PR95164]

This patch fixes a long-standing bug in reshape_init_r.  Since r209314
we implement DR 1467 which handles list-initialization with a single
initializer of the same type as the target.  In this test this causes
a crash in reshape_init_r when we're processing a constructor that has
undergone the DR 1467 transformation.

Take e.g. the

  foo({{1, {H{k}}}});

line in the attached test.  {H{k}} initializes the field b of H in I.
H{k} is a functional cast, so has TREE_HAS_CONSTRUCTOR set, so is
COMPOUND_LITERAL_P.  We perform the DR 1467 transformation and turn
{H{k}} into H{k}.  Then we attempt to reshape H{k} again and since
first_initializer_p is null and it's COMPOUND_LITERAL_P, we go here:

           else if (COMPOUND_LITERAL_P (stripped_init))
             gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init));

then complain about the missing braces, go to reshape_init_class and ICE
on
               gcc_checking_assert (d->cur->index
                                    == get_class_binding (type, id));

because due to the missing { } we're looking for 'b' in H, but that's
not found.

So we have to be prepared to handle an initializer whose outer braces
have been removed due to DR 1467.

gcc/cp/ChangeLog:

	PR c++/95164
	* decl.c (reshape_init_r): When initializing an aggregate member
	with an initializer from an initializer-list, also consider
	COMPOUND_LITERAL_P.

gcc/testsuite/ChangeLog:

	PR c++/95164
	* g++.dg/cpp0x/initlist123.C: New test.