Improve CPR behavior for strict constructors
When working on Trac #10482 I noticed that we could give constructor arguments the CPR property if they are use strictly. This is documented carefully in Note [CPR in a product case alternative] and also Note [Initial CPR for strict binders] There are a bunch of intersting examples in Note [CPR examples] which I have added to the test suite as T10482a. I also added a test for #10482 itself.
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