Michael Gottesman 8c5737d1d5 [ownership] Change thin_to_thick function to always produce a none value. ...

It can already only accept values with none ownership and the merging of
ownership around ownership phis ensure that if we phi this with a partial_apply
or the like, we get the appropriate ownership on any such ownership phi values.

We are now out of SILGen emitting fewer destroy_value unnecessarily on
thin_to_thick functions. This changed some codegen and also forced me to update
some tests/fix AutoDiff.

I also deleted the DebugInfo test mandatoryinlining-wrongdebugscope.swift since:

1. It was depending on these destroys being there.

2. Given the need to improve the test @aprantl suggested I just eliminate it
solving the test failure for me.

2020-10-23 17:49:12 -07:00

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