[clang] [CIR] Add support for array constructors (PR #149142)

[Henrich Lauko via cfe-commits]

================
@@ -22,15 +24,97 @@ struct LoweringPreparePass : public LoweringPrepareBase<LoweringPreparePass> {
   void runOnOperation() override;
 
   void runOnOp(Operation *op);
+  void lowerArrayCtor(ArrayCtor op);
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xlauko wrote:

```suggestion
  void lowerArrayCtor(cir::ArrayCtor op);
```

https://github.com/llvm/llvm-project/pull/149142