Add size= and offset= qualifiers to leak and possible leak suppressions

_From [rnk@google.com](https://code.google.com/u/rnk@google.com/) on January 19, 2012 16:01:18_

This is to support issue #741 . For leak suppressions where we don't have good symbols, as in issue #18 , it can help make the suppression more precise without resorting to something brittle like mod+offs.

The size= qualifier is fairly obvious in its simplest form. We could support a syntax for alternate sizes, such as size=18|24|32, and perhaps ranges (size=32<=x<=48)?.

The offset qualifier is useful for possible leaks where we have something like an SLIST_ENTRY embedded in a struct, as occurred in issue #18 ole32!EventEntry::CreatePoolEntry.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=759_