re PR debug/32914 (ICE in rtl_for_decl_init with -g option)

re PR debug/32914 (ICE in rtl_for_decl_init with -g option)

	PR debug/32914
	* dwarf2out.c (rtl_for_decl_init): If vector decl has CONSTRUCTOR
	initializer, use build_vector_from_ctor if possible to create
	VECTOR_CST out of it.  If vector initializer is not VECTOR_CST
	even after this, return NULL.

	* d++.dg/debug/const3.C: New test.
	* d++.dg/debug/const4.C: New test.
	* d++.dg/debug/dwarf2/const1.C: New test.
	* d++.dg/debug/dwarf2/const2.C: New test.
	* d++.dg/debug/dwarf2/const2b.C: New test.

From-SVN: r127854