[binutils-gdb] PR symtab/19914 fix handling of dwp + split debug

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 6c4474237ab3356b100ebbdd6ff1a8839745023d ***

Author: Doug Evans <dje@google.com>
Branch: master
Commit: 6c4474237ab3356b100ebbdd6ff1a8839745023d

PR symtab/19914 fix handling of dwp + split debug

	PR symtab/19914
	* dwarf2read.c (open_and_init_dwp_file): Look at backlink if objfile
	is separate debug file.

	testsuite/
	* gdb.dwarf2/dwp-sepdebug.c: New file.
	* gdb.dwarf2/dwp-sepdebug.exp: New file.