Hello,

In some binaries, a DIE named I originating from a compilation unit
written in the C++ language can be an implementation of a DIE named S
(linked through the DW_AT_specification attribute on I) originating
from a compilation unit written in, say, the C language.

In that case, when are we looking at I and try to get the scope of S
(which the DWARF reader considers as the logical scope of I)
get_scope_for_die needs to look at the DW_AT_language attribute
carried by the compilation unit DIE of S.  At the moment, we wrongly
look at the DW_AT_language carried by the compilation unit DIE of I
and we deduce the wrong language (C++ instead of C).

This patch fixes that.

	* src/abg-dwarf-reader.cc (get_scope_for_die): Get the language of
	the DIE from the compilation unit of the DIE itself.
	* tests/data/test-types-stability/PR27165-libzmq.so.5.2.3: New
	test input.
	* tests/data/test-types-stability/PR27165-libzmq.so.5.2.3.debug:
	Debug information for the new test input.
	* tests/data/Makefile.am: Add the test inputs above to the source
	distribution.
	* tests/test-types-stability.cc (elf_paths): Add the new test
	inputs to this test harness.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>

Applied to master.

The patch is big so I am attaching it gzipped here.