[clang] [OpenMP][ASan] Enable ASan Instrumentation for AMDGPUOpenMPToolChain. (PR #124754)

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b-sumner wrote:

> Broad question, should we instead aim for having `-fsanitize` work for both sides? I've always been very much against all these `*-gpu` bloat flags when we could just do `-Xarch_host -fsanitize` or `-Xarch_device -fsanitize`. The word against that it usually whether or not it would force people to update some makefiles.

I'm not sure I follow the question exactly, but in my opinion it does not make sense to independently control instrumentation for host and device.  We had to implement a means to control instrumentation on the device when development started and after we changed its default once development was complete we kept the option just in case.

https://github.com/llvm/llvm-project/pull/124754