dillon1000/react

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[hir] Use a stable identity for undefined value

InferReferenceEffects uses object identity to merge states, which breaks when we 
create a new object to model `undefined`. 

Two value objects representing `undefined` are not equal due to referential 
equality. 

Instead, let's use a singleton to represent `undefined` value.
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Sathya Gunasekaran authored 3aaf8be25cc4db8307eb3f6ce65a0bc4101d43e8 Parent b7a14ec
Changed paths6 files
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M compiler/packages/babel-plugin-react-forget/src/Inference/InferReferenceEffects.ts ModifiedA compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/for-loop-let-undefined-decl.expect.md AddedA compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/for-loop-let-undefined-decl.js AddedA compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/loop-unused-let.expect.md AddedA compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/loop-unused-let.js AddedM compiler/packages/sprout/src/SproutTodoFilter.ts Modified
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