The main change here is to replace a crosses_call boolean with
a bitmask of the ABIs used by the crossed calls.  For space reasons,
I didn't also add a HARD_REG_SET that tracks the set of registers
that are actually clobbered, which means that this is the one part
of the series that doesn't benefit from -fipa-ra.  The existing
FIXME suggests that the current structures aren't the preferred
way of representing this anyhow, and the pass already makes
conservative assumptions about call-crossing registers.

2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* sel-sched-ir.h (_def::crosses_call): Replace with...
	(_def::crossed_call_abis): ..this new field.
	(def_list_add): Take a mask of ABIs instead of a crosses_call
	boolean.
	* sel-sched-ir.c (def_list_add): Likewise.  Update initialization
	of _def accordingly.
	* sel-sched.c: Include function-abi.h.
	(hard_regs_data::regs_for_call_clobbered): Delete.
	(reg_rename::crosses_call): Replace with...
	(reg_rename::crossed_call_abis): ...this new field.
	(fur_static_params::crosses_call): Replace with...
	(fur_static_params::crossed_call_abis): ...this new field.
	(init_regs_for_mode): Don't initialize sel_hrd.regs_for_call_clobbered.
	(init_hard_regs_data): Use crtl->abi to test which registers the
	current function would need to save before it uses them.
	(mark_unavailable_hard_regs): Update handling of call-clobbered
	registers, using call_clobbers_in_region to find out which registers
	might be call-clobbered (but without taking -fipa-ra into account
	for now).  Remove separate handling of partially call-clobbered
	registers.
	(verify_target_availability): Use crossed_call_abis instead of
	crosses_call.
	(get_spec_check_type_for_insn, find_used_regs): Likewise.
	(fur_orig_expr_found, fur_on_enter, fur_orig_expr_not_found): Likewise.

From-SVN: r276336