support HEAP_GENERATE_EXCEPTIONS in -replace_malloc

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on May 04, 2013 21:07:35_

xref related issue #957 if ((arena != NULL && TEST(HEAP_GENERATE_EXCEPTIONS, arena->flags)) ||
TEST(HEAP_GENERATE_EXCEPTIONS, flags)) {
ASSERT(false, "HEAP_GENERATE_EXCEPTIONS NYI");
/\* FIXME: need to call RtlRaiseException or sthg
\* But, have to be careful: will it work calling it natively or will
\* we need to dr_redirect_execution() to get the call interpreted?
*/

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1214_