TweakCCode breaks table access (sometimes)

[mzattera]

The attached file if compiled with BF_fbf.bat generate wrong results, it is correct if we skip TweakCCode optimization for accessing
tables.

#LINEBREAKS 72
#LINEMODE DOS			

#DIM ics
#TABLE stack 10
#DIM stack@top@

#dim a b c

msg W esseTop-
byte2ascii stack@top@ a b c 
print a b c
line
WTABLE stack stack@top@ 66
INC stack@top@ 1

msg W esseTop-
byte2ascii stack@top@ a b c 
print a b c
line
WTABLE stack stack@top@ 90
INC stack@top@ 1

msg W esseTop-
byte2ascii stack@top@ a b c 
print a b c
line
WTABLE stack stack@top@ 65
INC stack@top@ 1



DEC stack@top@ 1
msg R esseTop-
byte2ascii stack@top@ a b c 
print a b c
line

RTABLE stack stack@top@ ics
msg ics-
byte2ascii ics a b c 
print a b c
line

DEC stack@top@ 1
msg R esseTop-
byte2ascii stack@top@ a b c 
print a b c
line

RTABLE stack stack@top@ ics
msg ics-
byte2ascii ics a b c 
print a b c
line

DEC stack@top@ 1
msg R esseTop-
byte2ascii stack@top@ a b c 
print a b c
line

RTABLE stack stack@top@ ics
msg ics-
byte2ascii ics a b c 
print a b c
line