dillon1000/react

[aliasing] Introduce Effect.Capture

Effect.Capture is very similar to Effect.Read, but the only difference is that 
this reference is stored somewhere via a Effect.Store. 

Previously, any operand associated with a Effect.Store in the same instruction 
would get aliased -- so there was no need to explicitly differentiate between a 
"normal read" and "read that gets stored". 

This difference is now explicit with FunctionExpression where every dependency 
is "read" but only a few are "captured" for store (and mutation). In a follow up 
PR, the mutating deps will have an Effect.Capture to differentiate from the 
other non mutating deps (Effect.Read).