[llvm] [DirectX] Add GlobalDCE pass after finalize linkage pass in DirectX backend (PR #151071)

[Justin Bogner via llvm-commits]

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@@ -1,10 +1,17 @@
-; RUN: opt -S -dxil-finalize-linkage -mtriple=dxil-unknown-shadermodel6.5-compute %s | FileCheck %s
+; RUN: opt -S -passes='dxil-finalize-linkage,globaldce' -mtriple=dxil-unknown-shadermodel6.5-compute %s | FileCheck %s
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bogner wrote:

I think it'd be better to have this pass explicitly check that the linkage was updated correctly rather than running globaldce in this run line.

If we want to test that the whole pipeline eliminates the right globals we could do that separately with an `llc` test.

https://github.com/llvm/llvm-project/pull/151071