GitLab

changed all get_tarval_* into faster get_mode_*

cleaned up code handling Proj(Node))
added more optimizations:
 - handling compare with MIN/MAX values
 - -a == c ==> a == -c, -a != c ==> a != -c
 - ADD(a,MINUS(b)) => SUB(a,b)
 - MUL(a, -1) ==> MINUS(a)

[r5979]