patch applied (ghc-6.6/ghc): If we get an unknown or unimplemented opcode, say what it is

[Ian Lynagh]

Thu Sep  7 10:10:38 PDT 2006  Ian Lynagh <igloo at earth.li>
  * If we get an unknown or unimplemented opcode, say what it is

    M ./rts/Interpreter.c -1 +2