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bug of define a bit in bdata

24571;26480; 40644;

C:
bdata unsigned BUFR16=0;
sbit BIT8=BUFR16^8;

the assemble language which is compiled by Keil uVision3:
C:0x1172 9210 MOV BIT8(0x22.0),C
......
;BUFR16<<=1;
C:0x117D E522 MOV A,0x22
C:0x117F 25E0 ADD A,ACC(0xE0)
C:0x1181 F522 MOV 0x22,A
C:0x1183 E521 MOV A,BUFR16(0x21)
C:0x1185 33 RLC A
C:0x1186 F521 MOV BUFR16(0x21),A
......

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