Add a unittest to verify for assumption cache
Add a unittest to verify for assumption cache

Reviewers: vsk, tejohnson

Reviewed By: vsk

Differential Revision: https://reviews.llvm.org/D68095

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@373811 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 2d07bfd5effc6603f91954862ad18b8156948e8d)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm