Teach stack promotion to walk the CFG when a potential reuse of an allocation is found to see if it can actually happen instead of just assuming it will. This allows it to catch cases like {{{ int i; Foo f; while (cond(i)) f = new Foo(i++); return f.value; }}} where it previously wouldn't because a phi using the allocation would appear in the condition block to propagate it to the use after the loop.

6cffbfff0363a122e6742fe5083d330519224b6b 0.9
a6dfd3cb5b99a10d3917bd8ed87d844ac2975a62 0.9.1