Switch statement: extra out-of-bounds code emitted

[John Wehle]

> Perhaps more usefully,
> 
>    switch ( i&7 ) {    /* or i%8 */
>      case 0: case 1: case 2: case 3:  /* case bodies omitted */
>      case 4: case 5: case 6: case 7:
>    }
> 
> could omit the bounds checks.  This isn't dependent on the type of i.

VRP currently does remove the bounds check.

-- John
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