[clang] [CIR] Upstream ArraySubscriptExpr for fixed size array (PR #134536)

[Andy Kaylor via cfe-commits]

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@@ -198,6 +198,19 @@ class CIRGenBuilderTy : public cir::CIRBaseBuilderTy {
 
     return create<cir::BinOp>(loc, cir::BinOpKind::Div, lhs, rhs);
   }
+
+  /// Create a cir.ptr_stride operation to get access to an array element.
+  /// idx is the index of the element to access, shouldDecay is true if the
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andykaylor wrote:

```suggestion
  /// \p idx is the index of the element to access, \p shouldDecay is true if the
```

https://github.com/llvm/llvm-project/pull/134536