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Joe Savona
2d8dc3ec4f
This completes the implementation of InferReactiveScopeVariables, adding support
for phi nodes. Example:
```javascript
let x$0 = null;
mutate(x$0);
if (cond) {
x$1 = a;
mutate(x$1)
} else {
x$2 = b;
}
x$3 = phi(x$1, x$2);
mutate(x$3);
```
We now add x$1, x$2, and x$3 to the same reactive scope. This reflects the fact
that x$3 cannot be computed without also computing both x$1 and x$2. Note that
x$3 can never be x$0, so x$0 is _not_ added to the same scope. This allows us to
take advantage of SSA form to note that _some_ instances of an identifier really
are distinct.