Returns the image to normal garbage collection activity in 32-bit LispWorks.
The function returns the single result
normal-gc resets various internal parameters that determine the frequency and extent of garbage collection to their default settings.
normal-gc is generally used in conjunction with avoid-gc, to cancel the effects of the latter.
normal-gc is useful only in 32-bit LispWorks. In 64-bit implementations it does nothing and simply returns
LispWorks User Guide and Reference Manual - 20 Sep 2017