dwarf2out.c (dwarf2out_frame_debug): Assume that in a PARALLEL prologue insn, only the first elt is significant.

	* dwarf2out.c (dwarf2out_frame_debug): Assume that in a PARALLEL
 	prologue insn, only the first elt is significant.
	(output_call_frame_info): For exception handling, always use 4-byte
 	fields as specified by the dwarf2 spec.
	Don't skip trivial FDEs.

From-SVN: r15154