Print region argument only when argAttrs are present

Fixes: #132894

Author: hiraditya

mlir/lib/Interfaces/CallInterfaces.cpp

@@ -118,7 +118,8 @@ void call_interface_impl::printFunctionSignature(
       ArrayRef<NamedAttribute> attrs;
       if (argAttrs)
         attrs = llvm::cast<DictionaryAttr>(argAttrs[i]).getValue();
-      p.printRegionArgument(body->getArgument(i), attrs);
+      if (body->getNumArguments() > i)
+        p.printRegionArgument(body->getArgument(i), attrs);
     } else {
       p.printType(argTypes[i]);
       if (argAttrs)

mlir/test/mlir-opt/print-region.mlir

@@ -0,0 +1,17 @@
+// Bug: https://github.com/llvm/llvm-project/issues/132894
+
+// RUN: mlir-opt %s | FileCheck
+
+// CHECK: module {
+// CHECK:   spirv.func @f(f32) "None" {
+// CHECK:     %c0 = arith.constant 0 : index
+// CHECK:     spirv.Return
+// CHECK:   }
+// CHECK: }
+
+module {
+  spirv.func @f(f32) "None" {
+    %c0 = arith.constant 0 : index
+    spirv.Return
+  }
+}