[RFA] Constify h8300 support.

[Klee Dienes <klee at apple dot com>]

The issue here was that the disassembler wanted to be able to compute 
the length field at init-time.  I removed the length field from the 
opcode vector, made it const, and wrapped the table in another table 
allocated at init-time that contains the computed length fields.

Another option would have been to update the opcodes table to 
explicitly specify the length; I opted against that choice because (a) 
it would have been more error-prone, (b) it uses more static data; 
whereas by dynamically computing it, it only gets allocated if the 
target is used, and (c) it was a bigger change to the sources.

Attachment: h8300-const.txt
Description: Text document