[InlineFunction] add nonnull assumptions based on argument attributes

This was suggested in D27855: have the inliner add assumptions, so we don't 
lose nonnull info provided by argument attributes.

This still doesn't solve PR28430 (dyn_cast), but this gets us closer.

https://reviews.llvm.org/D29999


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296366 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed