proper translation of flushed fragments

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on February 23, 2011 10:36:03_

this was PR 208037

translating by recreating has the problem that app memory may no longer match what faulting fragment was built from

we have an option -safe_translate_flushed that stores translations at flush time so we never use recreation for flushed fragments

summary of what's still missing for this case so we can turn on
-safe_translate_flushed by default:
UNDONE: dll unload optimization => -safe_translate_flushed on by default
UNDONE: for selfmod need to store info at emit time to handle racy mods (though not critical: see args above)

xref issue #398

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=399_