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

[via llvm-commits]

elhewaty wrote:

@dtcxzyw  Thanks,
what about the following error, does it have something to do with file permissions?
```
RUN: at line 5: rm -rf build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp && split-file /llvm-project/llvm/test/tools/llvm-ranlib/error-opening-permission.test build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp && cd build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp
+ rm -rf build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp
+ split-file llvm-project/llvm/test/tools/llvm-ranlib/error-opening-permission.test build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp
+ cd build/test/tools/llvm-ranlib/Output/error-opening-permission.test.tmp
```



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