GPU: Add Device::deviceVendor() function and fix #3416

[mirenradia]

Summary

This adds a function that returns the GPU's vendor.

Additional background

This function is only really relevant for SYCL (although only Intel GPUs are officially supported with the SYCL backend AFAIK). For CUDA and HIP it is inferred at compile time.

This function is used to disable SIGSEGV handling by default on Intel GPUs to fix #3416. In theory, we could only default disable SIGSEGV handling for specific Intel GPU architectures (e.g. using the experimental oneAPI SYCL Device Architecture extension) since integrated Intel GPUs are not affected by #3416 but this would need to be updated every time Intel releases a new GPU architecture which still uses SIGSEGV for managed memory. It is simpler to disable it by default on all Intel GPUs.

Checklist

The proposed changes:

• fix a bug or incorrect behavior in AMReX
• add new capabilities to AMReX
• changes answers in the test suite to more than roundoff level
• are likely to significantly affect the results of downstream AMReX users
• include documentation in the code and/or rst files, if appropriate