m68k-protos.h (use_return_insn): Change return type from int to bool.

m68k-protos.h (use_return_insn): Change return type from int to bool.

	* config/m68k/m68k-protos.h (use_return_insn): Change return type from
	int to bool.
	* config/m68k/m68k.c (struct m68k_frame): Add funcdef_no member.
	(current_frame): New global var.
	(m68k_compute_frame_layout): Cache computations in current_frame.
	(m68k_initial_elimination_offset): Use values from current_frame
	instead of recomputing them.
	(use_return_insn): Likewise.
	(m68k_output_function_prologue): Likewise.
	(m68k_output_function_epilogue): Likewise.
	* config/m68k/m68k.h (TARGET_CPU_CPP_PREDEFINES): Fold __PIC__ handling
	inside the block for __pic__.

From-SVN: r72330