[patch] Fix debug info for discriminated record types

[Eric Botcazou]

Hi,

this is a regression present on the mainline and 9 branch: since
  https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01066.html
the debug info emitted in Ada with -fgnat-encodings=minimal for discriminated 
record types containing an array component whose bound is a discriminant is 
incomplete, i.e. the DW_AT_*_bound attribute of the range subtype is missing.

Tested on x86_64-suse-linux, OK for mainline and 9 branch?


2019-07-03  Eric Botcazou  <ebotcazou@adacore.com>

	* dwarf2out.c (add_scalar_info): Add back refererence to existing DIE
	if it has the DW_AT_data_member_location attribute.


2019-07-03  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/specs/debug1.ads: New test.
	
-- 
Eric Botcazou
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