#511 compile-time optimization: EVALUATE single-var TO switch
There are at least 3 reasonable optimizations:
1: translate EVALUATE pic-x1-item WHEN 'a'... to switch (pic-x1-data) {case 'a'}
2: internally do that for EVALUATE TRUE when all elements are 88-condition-names for the same variable
this would be a minor performance update, mostly generating "nicer code" than the current one
3: optional: do something similar for pic-xN-items (possibly with N <=3/9/???) using a switch for each position - but that would need a go to label to reach the WHEN OTHER/end position within the inner default case - but then... we likely have at least the end label for the current generation of if (memcmp(...)) already
This would be a bigger optimization for commonly executed comparisons of "status" and "type" fields which may be longer.
