Bug 24378 - DW_TAG_subroutine_type as a DIE scope causes infinite loop

Bug 24378 - DW_TAG_subroutine_type as a DIE scope causes infinite loop

GCC 4.3.2 wrongly emits some type definition DIEs in the scope of a
DW_TAG_subroutine_type.  Whenever the DWARF reader tries to get the
scope of a DIE during the computation of the pretty name of a type DIE
which scope is (wrongly) emitted as being a DW_TAG_subroutine_type
things end-up in an infinite loop.

This patch makes get_scope_die to look through the
DW_TAG_subroutine_type to return the proper scope instead, just like
what we already do for DW_TAG_subprogram and DW_TAG_array_type.

	* src/abg-dwarf-reader.cc (get_scope_die): Look through
	DW_TAG_subroutine_type to get the scope of a given DIE.
	* tests/data/Makefile.am: Add the two new files below to source
	distribution.
	* tests/data/test-read-dwarf/PR24378-fn-is-not-scope.abi: New
	reference test output.
	* tests/data/test-read-dwarf/PR24378-fn-is-not-scope.o: New binary
	test input.
	* tests/test-read-dwarf.cc (in_out_specs): Add the new test input
	to the test harness.

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