APP CRASH calc.exe with client api/samples/cbr

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on February 16, 2009 17:50:30_

api/samples/cbr (after instr_convert_short_meta_jmp_to_long() now
returns long-taken and we avoid a reachability assert) causes app crash on
calc when starting up: works fine with -disable_traces so probably
decode_fragment() mis-interpreting the client's jecxz-expansion (xref PR
266292)?

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=21_