rtl-ssa: Add new helper functions

This patch adds some RTL-SSA helper functions.  They will be
used by the upcoming late-combine pass.

The patch contains the first non-template out-of-line function declared
in movement.h, so it adds a movement.cc.  I realise it seems a bit
over-the-top to have a file with just one function, but it might grow
in future. :)

gcc/
	* Makefile.in (OBJS): Add rtl-ssa/movement.o.
	* rtl-ssa/access-utils.h (accesses_include_nonfixed_hard_registers)
	(single_set_info): New functions.
	(remove_uses_of_def, accesses_reference_same_resource): Declare.
	(insn_clobbers_resources): Likewise.
	* rtl-ssa/accesses.cc (rtl_ssa::remove_uses_of_def): New function.
	(rtl_ssa::accesses_reference_same_resource): Likewise.
	(rtl_ssa::insn_clobbers_resources): Likewise.
	* rtl-ssa/movement.h (can_move_insn_p): Declare.
	* rtl-ssa/movement.cc: New file.

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