[mlir] Rectify mishandling in DenseElementsAttr::get(...) causing crash with assertion when using mlir-opt --canonicalize

Resolves #74236

In `BuiltinAttributes` when we recursively handle complex types and
simplify them into integer, float, string, etc., index type needs to
be handled for vector-based operations before making an assertion.

Author: Rajveer100

mlir/lib/IR/BuiltinAttributes.cpp

@@ -958,6 +958,8 @@ DenseElementsAttr DenseElementsAttr::get(ShapedType type,
       intVal = floatAttr.getValue().bitcastToAPInt();
     } else {
       auto intAttr = llvm::cast<IntegerAttr>(values[i]);
+      if (intAttr.getType().isIndex())
+        continue;
       assert(intAttr.getType() == eltType &&
              "expected integer attribute type to equal element type");
       intVal = intAttr.getValue();

mlir/test/mlir-opt/issue-74236.mlir

@@ -0,0 +1,10 @@
+// RUN: mlir-opt -split-input-file -verify-diagnostics %s
+
+llvm.func @malloc(i64) -> !llvm.ptr
+func.func @func2(%arg0: index, %arg1: memref<13x13xi64>, %arg2: index) {
+  %cst_7 = arith.constant dense<1526248407> : vector<1xi64>
+  %1 = llvm.mlir.constant(1 : index) : i64
+  %101 = vector.insert %1, %cst_7 [0] : i64 into vector<1xi64>
+  vector.print %101 : vector<1xi64>
+  return
+}