[clang] [StaticAnalyzer] Make it a noop when initializing a field of empty record (PR #138594)

[Balazs Benics via cfe-commits]

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@@ -0,0 +1,50 @@
+// RUN: %clang_analyze_cc1 -analyzer-checker=cplusplus -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=cplusplus -verify %s -DEMPTY_CLASS
+// UNSUPPORTED: system-windows
+// expected-no-diagnostics
+
+// This test reproduces the issue that previously the static analyzer
+// initialized an [[__no_unique_address__]] empty field to zero,
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steakhal wrote:

```suggestion
// initialized an [[no_unique_address]] empty field to zero,
```

https://github.com/llvm/llvm-project/pull/138594