search for: getnonlocallcalldependency

...tail call, and the other we don't, the load way back at %4. I could teach GVN that this particular clobber dependency is irrelevant for this call (and i will :P). But the reality is we don't even need to be looking back that far for dependencies. I'd like to extend the interface for getNonLocallCallDependency optionally take a set of stopping point instructions (or BB's, depending on how expensive testing on every instruction ends up being), and to not look for dependencies back past these points (at least for whatever path it's currently following. You can't short-circuit the whole thing be...