[clang] [llvm] [DirectX] Remove trivially dead functions at linkage finalize (PR #106146)

[Greg Roth via cfe-commits]

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+; RUN: opt -S -dxil-finalize-linkage -mtriple=dxil-unknown-shadermodel6.5-compute %s | FileCheck %s
+; RUN: llc %s --filetype=asm -o - | FileCheck %s
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pow2clk wrote:

Yes, and this test expects them to. The exported functions start at line 137 and all of them have checks that they remain defined.

https://github.com/llvm/llvm-project/pull/106146