powerpc: Introduce new __REG_R macros

#define	R30	30

#define	R31	31

#define	__REG_R0	0

#define	__REG_R1	1

#define	__REG_R2	2

#define	__REG_R3	3

#define	__REG_R4	4

#define	__REG_R5	5

#define	__REG_R6	6

#define	__REG_R7	7

#define	__REG_R8	8

#define	__REG_R9	9

#define	__REG_R10	10

#define	__REG_R11	11

#define	__REG_R12	12

#define	__REG_R13	13

#define	__REG_R14	14

#define	__REG_R15	15

#define	__REG_R16	16

#define	__REG_R17	17

#define	__REG_R18	18

#define	__REG_R19	19

#define	__REG_R20	20

#define	__REG_R21	21

#define	__REG_R22	22

#define	__REG_R23	23

#define	__REG_R24	24

#define	__REG_R25	25

#define	__REG_R26	26

#define	__REG_R27	27

#define	__REG_R28	28

#define	__REG_R29	29

#define	__REG_R30	30

#define	__REG_R31	31

/* sorted alphabetically */

#define PPC_INST_DCBA			0x7c0005ec

#define PPC_INST_DCBA_MASK		0xfc0007fe