Reapply "[InferAttributes] Materialize all infered attributes for...

Reapply "[InferAttributes] Materialize all infered attributes for declaration"" and follow on patches.

This reverts commit ab98f2c7 and 98eea392.

It includes a fix for the clang test which triggered the revert.  I failed to notice this one because there was another AMDGPU llvm test with a similiar name and the exact same text in the error message.  Odd.  Since only one build bot reported the clang test, I didn't notice that one.