[llvm] [NVPTX] Use .common linkage for common globals (PR #84416)

[Fangrui Song via llvm-commits]

MaskRay wrote:

I am not familiar with NVPTX. Is the common symbol behavior similar to things described on https://maskray.me/blog/2022-02-06-all-about-common-symbols ?

https://github.com/llvm/llvm-project/pull/84416