[llvm] [AMDGPU] Be less optimistic when allocating module scope lds (PR #161464)

[Juan Manuel Martinez Caamaño via llvm-commits]

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@@ -647,7 +649,8 @@ class AMDGPULowerModuleLDS {
           ModuleScopeVariables.insert(GV);
         } else if (K.second.size() == 1) {
           KernelAccessVariables.insert(GV);
-        } else if (set_is_subset(K.second, HybridModuleRootKernels)) {
+        } else if (K.second.size() == HybridModuleRootKernelsSize &&
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jmmartinez wrote:

Isn't the same as ?

```suggestion
        } else if (K.second == HybridModuleRootKernels) {
```

https://github.com/llvm/llvm-project/pull/161464