dillon1000/react

[hir] represent PropertyCall as receiver + PropertyLoad

How Forget currently lowers PropertyCall: 

```js 

// source: [[ calleeExpr ]].propertyName( [[ argExpr0 ]]) 

$0 = [[ calleeExpr ]] 

$1 = [[ argExpr0 ]] 

$2 = PropertyCall callee=$0 property="propertyName" args=[$1] 

``` 

This PR changes the lowering: 

```js 

// source: [[ calleeExpr ]].propertyName( [[ argExpr0 ]]) 

$0 = [[ calleeExpr ]] 

$1 = PropertyLoad $0 "propertyName" 

$2 = [[ argExpr0 ]] 

$3 = PropertyCall callee=$0 fn=$1 args=[$2] 

``` 

From my understanding, `PropertyCall` needs the receiver to properly model JS 
semantics which is something like `resolvedFn.apply(resolvedCallee, arg0, arg1, 
...)`. This is additionally useful for: 

- Fine-grained mutability / alias analysis. The property call is technically a 
read of the resolved function, and a mutate of the callee. 

- Dependency tracking. While we could special case PropertyCall, this 
representation would correctly add both callee and callee.propertyName as 
dependencies for PropertyCall. 

e.g. 

```js 

let x = []; 

mutate(x); 

useFreeze(x); 

let y = {}; 

y.a = x.bar(); 

return y; 

```