Don't apply normalize_new_instances transformation without init-class information is unavailable
Don't apply normalize_new_instances transformation without init-class information is unavailable

Summary:
... as this could leave behind dangling new-instance instructions that LocalDce couldn't remove.
This is not a correctness issue, as dangling new-instance instructions are harmless. But they are clearly undesirable for performance and space reasons.

Reviewed By: beicy

Differential Revision: D32120555

fbshipit-source-id: 4bc9c54551088fbb2c6f0eb858d61a71fb3d96fb

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