fix: create new op in generic type conversion

converting types of the original op seems to have an impact on other
operations using the result type, which should consider checking the
different cases (whether the type has been converted yet, or not).
However, creating a new op don't have this issue

compiler/include/concretelang/Conversion/Utils/GenericOpTypeConversionPattern.h

@@ -54,11 +54,12 @@ struct GenericTypeConverterPattern : public mlir::OpRewritePattern<Op> {
 
   mlir::LogicalResult
   matchAndRewrite(Op op, mlir::PatternRewriter &rewriter) const override {
-    convertOperandAndResultTypes(rewriter, op,
+    auto newOp = rewriter.clone(*op);
+    convertOperandAndResultTypes(rewriter, newOp,
                                  [&](mlir::MLIRContext *, mlir::Type t) {
                                    return converter.convertType(t);
                                  });
-
+    rewriter.replaceOp(op, newOp->getResults());
     return mlir::success();
   }