KT-17970 Intention actions to format parameter/argument list placing each on separate line

#KT-17970 Fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/KtParameterList.java

@@ -20,6 +20,7 @@ import com.intellij.lang.ASTNode;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.lexer.KtTokens;
 import org.jetbrains.kotlin.psi.stubs.KotlinPlaceHolderStub;
 import org.jetbrains.kotlin.psi.stubs.elements.KtStubElementTypes;
 
@@ -78,4 +79,14 @@ public class KtParameterList extends KtElementImplStub<KotlinPlaceHolderStub<KtP
         if (!(parent instanceof KtFunction)) return null;
         return (KtFunction) parent;
     }
+
+    @Nullable
+    public PsiElement getRightParenthesis() {
+        return findChildByType(KtTokens.RPAR);
+    }
+
+    @Nullable
+    public PsiElement getLeftParenthesis() {
+        return findChildByType(KtTokens.LPAR);
+    }
 }