[llvm] [NVPTX] Merge consecutive elements while buffering constant vectors with sub-byte datatype. (PR #183628)

[Karthik Senthil via llvm-commits]

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karthik-senthil wrote:

I have updated other loops in this patch to use `llvm:seq`. This seems to be consistent with other parts of `NVPTXAsmPrinter`.

https://github.com/llvm/llvm-project/pull/183628