[llvm] [NVPTX] Customize getScalarizationOverhead (PR #128077)

[Artem Belevich via llvm-commits]

Artem-B wrote:

Here's a more apples-to-apples comparison, where I literally replaced `mov.b32` with `cvt.b32.b16, shift, or`: https://godbolt.org/z/96s7nGGrx

Afaict, the generated code is almost identical, modulo different order of instructions.


https://github.com/llvm/llvm-project/pull/128077