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Joe Savona
8be56418d3
Fixes T175227223. When inferring reactivity, mutation of a value with a reactive input marks the mutable value as reactive. However, we also need to account for aliases: ```javascript const x = []; const y = x; y.push(props.value); ``` Previously we would have only considered `y` reactive here, but `x` also becomes reactive. The implementation extracts out a helper from InferReactiveScopeVariables that builds a `DisjointSet<Identifier>` of disjoint sets of mutably aliased values. InferReactivePlaces then treats all instances of each mutable alias group as equivalent for reactivity purposes.