[llvm] [NVPTX] Implement isTruncateFree and isZExtFree for i32/i64 Optimizations (PR #114683)

[Artem Belevich via llvm-commits]

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+; RUN: llc -march=nvptx64 < %s | FileCheck %s
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Artem-B wrote:

You may want to use `llvm/utils/update_llc_test_checks.py` to generate the checks.

https://github.com/llvm/llvm-project/pull/114683