[llvm] [AMDGPU] Add test for fpext & fptrunc with bf16. (PR #85909)

[Stanislav Mekhanoshin via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -march=amdgcn -mcpu=gfx940 < %s | FileCheck --check-prefixes=GCN %s
+
+; TODO: Add global-isel when it can support bf16
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rampitec wrote:

Add a blank line after the comment and it is fine.

https://github.com/llvm/llvm-project/pull/85909