SH: try to workaround fp-reg related move insns

SH: try to workaround fp-reg related move insns

LRA will try to satisfy the constraints in match_scratch for the memory
displacements and it will make issues on this target. To mitigate the
issue, split movsf_ie_ra into several new patterns to remove
match_scratch.  Also define a new sub-pattern of movdf for constant
loads.

gcc/ChangeLog:
	* gcc/config/sh/predicates.md (pc_relative_load_operand):
	New predicate.
	* gcc/config/sh/sh-protos.h (sh_movsf_ie_ra_split_p): Remove.
	(sh_movsf_ie_y_split_p): New proto.
	* gcc/config/sh/sh.cc: (sh_movsf_ie_ra_split_p): Remove.
	(sh_movsf_ie_y_split_p): New function.
	(broken_move): Take movsf_ie_ra into account for fldi cases.
	* gcc/config/sh/sh.md (movdf_i4_F_z): New insn pattern.
	(movdf): Use it.
	(movsf_ie_ra): Use define_insn instead of define_insn_and_split.
	(movsf_ie_F_z, movsf_ie_Q_z, movsf_ie_y): New insn pattern.
	(movsf): Use new patterns.
	(movsf-1):  Don't split when operands[0] or operands[1]
	is fpul.
	(movdf_i4_F_z+7): New splitter.