[pmo] Update the memory use collector for ownership.

[gottesmm]

This is technically a NFC commit. The changes are:

1. When we scalarize loads/stores, we need to not just use unqualified
   loads/stores. Instead we need to use the createTrivial{Load,Store}Or APIs. In
   OSSA mode, this will propagate through the original ownership qualifier if the
   sub-type is non-trivial, but if the sub-type is non-trivial will change the
   qualifier to trivial. Today when the pass runs without ownership nothing is
   changed since I am passing in the "supports unqualified" flag to the
   createTrivial{Load,Store}Or API so that we just create an unqualified memop if
   we are passed in an unqualified memop. Once we fully move pmo to ownership, this
   flag will be removed and we will assert.

2. The container walker is taught about copy_value, destroy_value. Specifically,
   we teach the walker how to recursively look through copy_values during the walk
   and to treat a destroy_value of the box like a strong_release,
   release_value. Since destroy_value, copy_value only exist in [ossa] today, this
   is also NFC.

Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.

Resolves SR-NNNN.

[gottesmm]

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