Free the dynamic variable pointed to by the given variable.
<identifier> is any untyped or typed pointer variable.
<size> is the allocated byte count. It should be the same size that was given at allocation time.
There is no heavy check for pointer coherency (there is only a check that this is a valid RAM address).
The allocated memory should have been allocated by a call to the NEW or GETMEM standard built-in procedures.
This procedure is implemented only for HIGHPERF (PIC18) and ENHANCED (PIC16'1xxx).