operands[2] with operands[0] in operands[4]/operands[5].
Doing just two replace_rtx calls naively would result in the second
replacement undoing all that the first did if operands[1] and operands[2]
operands[2] with operands[0] in operands[4]/operands[5].
Doing just two replace_rtx calls naively would result in the second
replacement undoing all that the first did if operands[1] and operands[2]