[clang] [Clang] Implement P0963R3 "Structured binding declaration as a condition" (PR #130228)

[Matheus Izvekov via cfe-commits]

================
@@ -5452,6 +5477,11 @@ bool Compiler<Emitter>::visitSwitchStmt(const SwitchStmt 
*S) {
   if (!this->emitSetLocal(CondT, CondVar, S))
     return false;
 
+  if (auto *DD =
+          dyn_cast_if_present<DecompositionDecl>(S->getConditionVariable()))
+    if (!this->emitDecompositionVarInit(DD))
+      return false;
----------------
mizvekov wrote:

Nit:
```suggestion
  if (auto *DD =
          dyn_cast_if_present<DecompositionDecl>(S->getConditionVariable()); DD 
&& !this->emitDecompositionVarInit(DD))
      return false;
```

Maybe also deduplicate with the above.

https://github.com/llvm/llvm-project/pull/130228
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