fastpath for and/or/test with partially-undefined operands

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on December 21, 2010 10:33:41_

OP_and, OP_or, and OP_test require special handling: the app operand values must be examined and not just the shadow values. this is all in the slowpath today and that causes perf problems on spec2k gap and spec2k6 gcc (linux) and sjeng (windows)

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=254_