propagate partial-unaddr on loads?

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on December 10, 2010 17:58:07_

PR 485131

xref PR 406535, PR 406718, and several earlier cases before I started
filing in bugzilla (alloca, _chkstk, strcpy). we could propagate a
partial-unaddr load instead of raising an error at the load. however, for
many of these dword bit tricks, we would still complain a few instrs later,
just like we do for uninit, when it passes the partial-unaddr dword through
xor or and with magic constants like 0xfefefeff, so it may not be worth the
effort.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=158_