Fix for PR debug/37801

gcc/ChangeLog:
	* gcc/dwarf2out.c (gen_inlined_subroutine_die): Concentrate on
	generating inlined subroutine die only. We shouldn't be
	called for anything else.
	(gen_block_die): Don't generate inline subroutine debug info for
	abstract blocks.

gcc/testsuite/ChangeLog:
	* gcc/testsuite/gcc.dg/debug/20020224-1.c: Adjust the comment.
	Make sure to trigger inlining optimizations.
	* gcc/testsuite/gcc.dg/debug/dwarf2/inline2.c: New test.

From-SVN: r150796