[llvm] [NVPTX] Fixup EXT_LOAD lowering for i128 values (PR #138049)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

Thanks, looks straightforward enough to me but someone more familiar with the NVPTX backend might know more.

https://github.com/llvm/llvm-project/pull/138049