Commits on May 6, 2016

1. Make opcode 0x00 unreachable. …

   Make opcode 0x00 `unreachable`, and move `nop` to a non-zero opcode.
   
   All-zeros is one of the more common patterns of corrupted data. This
   change makes it more likely that code that is accidentally zeroed, in
   whole or in part, will be noticed when executed rather than silently
   running through a nop slide.
   
   Obviously, this doesn't matter when an opcode table is present, but
   if there is a default opcode table, it would presumably use the
   opcodes defined here.

   

   sunfishcode committed May 6, 2016
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