tgsi: Dump register number when dumping immediates.

tgsi: Dump register number when dumping immediates.

For example:

VERT
DCL IN[0]
DCL OUT[0], POSITION
DCL OUT[1], GENERIC[12]
DCL CONST[0..4]
DCL TEMP[0], LOCAL
DCL TEMP[1], LOCAL
IMM[0] UINT32 {4294967295, 0, 0, 0}
IMM[1] FLT32 {    0.0000,     1.0000,     0.0000,     0.0000}
  0: SEQ TEMP[0].x, CONST[3].xxxx, IMM[0].xxxx
  1: F2I TEMP[0].x, -TEMP[0]
  2: SEQ TEMP[1].x, CONST[4].xxxx, IMM[0].xxxx
  3: F2I TEMP[1].x, -TEMP[1]
  4: AND TEMP[0].x, TEMP[0].xxxx, TEMP[1].xxxx
  5: IF TEMP[0].xxxx :0
  6:   MOV TEMP[0], IMM[1].xyxy
  7: ELSE :0
  8:   MOV TEMP[0], IMM[1].yxxy
  9: ENDIF
 10: MOV OUT[1], TEMP[0]
 11: MOV OUT[0], IN[0]
 12: END

instead of

VERT
DCL IN[0]
DCL OUT[0], POSITION
DCL OUT[1], GENERIC[12]
DCL CONST[0..4]
DCL TEMP[0], LOCAL
DCL TEMP[1], LOCAL
IMM UINT32 {4294967295, 0, 0, 0}
IMM FLT32 {    0.0000,     1.0000,     0.0000,     0.0000}
  0: SEQ TEMP[0].x, CONST[3].xxxx, IMM[0].xxxx
  1: F2I TEMP[0].x, -TEMP[0]
  2: SEQ TEMP[1].x, CONST[4].xxxx, IMM[0].xxxx
  3: F2I TEMP[1].x, -TEMP[1]
  4: AND TEMP[0].x, TEMP[0].xxxx, TEMP[1].xxxx
  5: IF TEMP[0].xxxx :0
  6:   MOV TEMP[0], IMM[1].xyxy
  7: ELSE :0
  8:   MOV TEMP[0], IMM[1].yxxy
  9: ENDIF
 10: MOV OUT[1], TEMP[0]
 11: MOV OUT[0], IN[0]
 12: END