Split print_rtx into subroutines

Split print_rtx into subroutines

gcc/ChangeLog:
	* print-rtl.c (print_rtx): Rename "i" to "idx".  Split out the
	operand-printing "switch" statement into...
	(print_rtx_operand_code_0): ...this new function, ...
	(print_rtx_operand_code_e): ...this new function, ...
	(print_rtx_operand_codes_E_and_V): ...this new function, ...
	(print_rtx_operand_code_i): ...this new function, ...
	(print_rtx_operand_code_r): ...this new function, ...
	(print_rtx_operand_code_u): ...this new function, ...
	(print_rtx_operand): ...and this new function.

From-SVN: r241002