[mlir] [llvm] [clang] [AMDGPU] Update llvm-objdump lit tests for COV5 (PR #79039)

[Saiyedul Islam via cfe-commits]

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@@ -99,6 +99,7 @@ class ROCDLDialectLLVMIRTranslationInterface
       if (!llvmFunc->hasFnAttribute("amdgpu-flat-work-group-size")) {
         llvmFunc->addFnAttr("amdgpu-flat-work-group-size", "1,256");
       }
+      llvmFunc->addFnAttr("amdgpu-implicitarg-num-bytes", "256");
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saiislam wrote:

This PR depends on 79038 (the other review) and they both need to land together. When I created stacked PRs, it seems that Github brought both the commits together in this PR.

You may use [this ](https://github.com/llvm/llvm-project/pull/79039/commits/a66ac33975381b1acdae0c177842d2f711ad9ab9) to see changes of this review only.

https://github.com/llvm/llvm-project/pull/79039