[llvm] Add more generic `half` tests (NFC) (PR #157211)

[via llvm-commits]

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+; This is the DirectX counterpart to the generic `half.ll` test as DirectX has compilation errors
+; on some operations.
+; RUN: llc %s -o - -mtriple=dxil-pc-shadermodel6.3-library | FileCheck %s
+
+; As this is a graphics target, this just checks that compilation doesn't crash.
+; CHECK: {{.*}}
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beetrees wrote:

Added

https://github.com/llvm/llvm-project/pull/157211