c++: default mem-init of array [PR103946]

c++: default mem-init of array [PR103946]

In the patch for PR92385 I added asserts to see if we tried to make a
vec_init of a vec_init, but didn't see any in regression testing.  This
testcase is one case, which seems reasonable: we create a VEC_INIT_EXPR for
the aggregate initializer, and then again to express the actual
initialization of the member.  We already do similar collapsing of
TARGET_EXPR.  So let's just remove the asserts.

	PR c++/103946

gcc/cp/ChangeLog:

	* init.c (build_vec_init): Remove assert.
	* tree.c (build_vec_init_expr): Likewise.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/nsdmi-array1.C: New test.