Don't suggest non-stable parameter names in completion

idea/testData/completion/basic/custom/JavaMethodNamedArguments.kt

@@ -0,0 +1,6 @@
+import lib.JavaClass
+
+fun test() = JavaClass().foo(<caret>)
+
+// ABSENT: p0
+// ABSENT: paramName

idea/testData/completion/basic/custom/JavaMethodNamedArgumentsSrc/JavaClass.java

@@ -0,0 +1,5 @@
+package lib;
+
+public class JavaClass {
+    public void foo(int paramName) {}
+}