[llvm-bugs] [Bug 51124] New: regression CUDA error: unspecified launch failure

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51124

            Bug ID: 51124
           Summary: regression CUDA error: unspecified launch failure
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: xw111luoye at gmail.com
                CC: llvm-bugs at lists.llvm.org

Failing since ca662297d5fbbf65a19eaa6122d7c12815d8add9

Reproducer 1
https://github.com/ye-luo/openmp-target/tree/master/tests/global_variable/global_pointer
clang++ -fopenmp -fopenmp-targets=nvptx64 -O3 global.cpp main.cpp

reproducer 2
https://github.com/ye-luo/openmp-target/blob/master/tests/target_task/taskloop_offload_nowait.cpp
clang++ -fopenmp -fopenmp-targets=nvptx64 -O3 taskloop_offload_nowait.cpp

./a.out both give
```
CUDA error: unspecified launch failure 
Libomptarget error: Call to targetDataEnd failed, abort target.
Libomptarget error: Failed to process data after launching the kernel.
Libomptarget error: Run with LIBOMPTARGET_INFO=4 to dump host-target pointer
mappings.
Libomptarget error: Source location information not present. Compile with -g or
-gline-tables-only.
Libomptarget fatal error 1: failure of target construct while offloading is
mandatory
```

-O3 is critical to reproduce the issue

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