[clang] [CIR] Upstream handling of integral-to-pointer casts (PR #161653)

[Andy Kaylor via cfe-commits]

================
@@ -1889,6 +1889,25 @@ mlir::Value ScalarExprEmitter::VisitCastExpr(CastExpr *ce) {
     }
     return v;
   }
+  case CK_IntegralToPointer: {
+    auto DestCIRTy = cgf.convertType(destTy);
+    mlir::Value Src = Visit(const_cast<Expr *>(subExpr));
+
+    // Properly resize by casting to an int of the same size as the pointer.
+    // Clang's IntegralToPointer includes 'bool' as the source, but in CIR
+    // 'bool' is not an integral type.  So check the source type to get the
+    // correct CIR conversion.
+    auto MiddleTy = cgf.cgm.getDataLayout().getIntPtrType(DestCIRTy);
----------------
andykaylor wrote:

```suggestion
    mlirType middleTy = cgf.cgm.getDataLayout().getIntPtrType(destCIRTy);
```

https://github.com/llvm/llvm-project/pull/161653