Backport upstream patches to fix ICEs when using -fdebug-types-section.

Backport upstream patches to fix ICEs when using -fdebug-types-section.

gcc:

2012-08-09   Cary Coutant  <ccoutant@google.com>

    Backport of pending upstream patch.

	* dwarf2out.c (clone_as_declaration): Copy DW_AT_abstract_origin
	attribute.
	(generate_skeleton_bottom_up): Remove DW_AT_object_pointer attribute
	from original DIE.
	(clone_tree_hash): Rename to ...
	(clone_tree_partial): ... this; change callers.  Copy
	DW_TAG_subprogram DIEs as declarations.

2012-08-22   Cary Coutant  <ccoutant@google.com>

	* dwarf2out.c (should_move_die_to_comdat): A type definition
	can contain a subprogram definition, but don't move it to a
	comdat unit.

2012-08-29   Cary Coutant  <ccoutant@google.com>

	* dwarf2out.c (clone_tree_partial): Remove.
	(copy_decls_walk): Don't copy children of a declaration
	into a type unit.

2012-08-31   Cary Coutant  <ccoutant@google.com>

	* dwarf2out.c (clone_tree_partial): Restore.
	(copy_decls_walk): Call clone_tree_partial to copy children
	of non-declaration DIEs.

gcc/testsuite:

2012-08-09   Cary Coutant  <ccoutant@google.com>

    Backport of pending upstream patch.

	* g++.dg/debug/dwarf2/dwarf4-nested.C: New test case.
	* g++.dg/debug/dwarf2/dwarf4-typedef.C: Add
	-fdebug-types-section flag.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/google@200036 138bc75d-0d04-0410-961f-82ee72b054a4