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Enhances PureFunctionIdentifier to understand some types of functio…
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…n aliasing.

A particular special case is class constructors, including `super` calls. These were always considered unknown functions before, so all class instantiations were marked with side-effects. Now the indirection from class name to `"constructor" and `super` to class name is recognized.

Aliasing support is also added in the general case of conditional expressions, like `&&`, `||`, and `?:`. Functions assigned values using these are known to be aliases of the leaf expressions.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=242908412
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@nreid260 @lauraharker
nreid260 authored and lauraharker committed Apr 11, 2019
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