IPA ICF: remove dead code

IPA ICF: remove dead code

2019-10-30  Martin Liska  <mliska@suse.cz>

	* ipa-icf-gimple.c (func_checker::compare_ssa_name): Call
	compare_operand.
	(func_checker::compare_memory_operand): Remove.
	(func_checker::compare_cst_or_decl): Remove.
	(func_checker::operand_equal_valueize): Do not handle
	FIELD_DECL.
	(func_checker::compare_gimple_call): Call compare_operand.
	(func_checker::compare_gimple_assign): Likewise.
	* ipa-icf-gimple.h: Remove compare_cst_or_decl.
	* ipa-icf.c (sem_function::icf_handled_component_p): Remove.
	* ipa-icf.h (icf_handled_component_p): Remove.

From-SVN: r277616