[WIP] Avoid -fcompare-debug regressions due to ipa-polymorphic-call stuff (PR ipa/65610)

[Jan Hubicka]

> 
> 2015-03-30  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR ipa/65610
> 	* ipa-utils.h (inlined_polymorphic_ctor_dtor_block_p): Declare.
> 	* ipa-polymorphic-call.c (inlined_polymorphic_ctor_dtor_block_p): New
> 	function.
> 	(decl_maybe_in_construction_p, noncall_stmt_may_be_vtbl_ptr_store):
> 	Use it.
> 	* ipa-prop.c (param_type_may_change_p): Likewise.
> 	* tree-ssa-live.c: Include ipa-utils.h and its dependencies.
> 	(remove_unused_scope_block_p): Add in_ctor_dtor_block
> 	argument.  Before inlining, preserve
> 	inlined_polymorphic_ctor_dtor_block_p blocks and the outermost block
> 	with FUNCTION_DECL BLOCK_ABSTRACT_ORIGIN inside of them.  Adjust
> 	recursive calls.
> 	(remove_unused_locals): Adjust remove_unused_scope_block_p caller.
> 
> 	* g++.dg/ubsan/pr65610.C: New test.

Thank you! The patch is OK.

Honza