[CorrelatedValuePropagation] Infer nonnull attributes

LazuValueInfo can prove that value is nonnull based on the context information. 
Make use of this ability to infer nonnull attributes for the call arguments.

Differential Revision: http://reviews.llvm.org/D12836



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247707 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed