[llvm] [IR] Add nowrap flags for trunc instruction (PR #85592)

[Nikita Popov via llvm-commits]

nikic wrote:

Please also add a test in llvm/test/Transforms/SimplifyCFG/HoistCode.ll for the flag intersection behavior. See existing disjoint/nneg tests.

https://github.com/llvm/llvm-project/pull/85592