Do not report unused parameters for actual constructors

Extract common part for functions and constructors in
processUnusedParameter

compiler/testData/diagnostics/tests/multiplatform/headerClass/actualClassWithDifferentConstructors.kt

@@ -12,6 +12,7 @@ expect class Bar3()
 expect class Bar4()
 expect class Bar5()
 expect class Bar6()
+expect class Bar7(s: String)
 
 // MODULE: m2-jvm(m1-common)
 
@@ -48,3 +49,7 @@ actual class Bar5 {
 class <!ACTUAL_MISSING!>Bar6<!> {
     actual constructor()
 }
+
+actual class Bar7 actual constructor(s: String) {
+    constructor() : this("")
+}

compiler/testData/diagnostics/tests/multiplatform/headerClass/actualClassWithDifferentConstructors.txt

@@ -43,6 +43,13 @@ public final expect class Bar6 {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
+public final expect class Bar7 {
+    public constructor Bar7(/*0*/ s: kotlin.String)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 public final expect class Foo1 {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -105,6 +112,14 @@ public final class Bar6 {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
+public final actual class Bar7 {
+    public constructor Bar7()
+    public constructor Bar7(/*0*/ s: kotlin.String)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
 public final actual class Foo1 {
     public constructor Foo1(/*0*/ s: kotlin.String)
     public final val s: kotlin.String