Handle constructor usage for actual class as usage of expect class

#KT-25498 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/referenceUtil.kt

@@ -181,10 +181,13 @@ fun KtSimpleNameReference.canBePsiMethodReference(): Boolean {
 }
 
 private fun PsiElement.isConstructorOf(unwrappedCandidate: PsiElement) =
-    // call to Java constructor
+    when {
-        (this is PsiMethod && isConstructor && containingClass == unwrappedCandidate) ||
+        // call to Java constructor
+        this is PsiMethod && isConstructor && containingClass == unwrappedCandidate -> true
         // call to Kotlin constructor
-    (this is KtConstructor<*> && getContainingClassOrObject() == unwrappedCandidate)
+        this is KtConstructor<*> && getContainingClassOrObject().isEquivalentTo(unwrappedCandidate) -> true
+        else -> false
+    }
 
 fun AbstractKtReference<out KtExpression>.renameImplicitConventionalCall(newName: String?): KtExpression {
     if (newName == null) return expression

idea/testData/multiModuleFindUsages/findActualInterface/common/common.kt

@@ -0,0 +1,2 @@
+expect interface I
+expect class C : I

idea/testData/multiModuleFindUsages/findActualInterface/jvm/jvm.kt

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtClass
+// OPTIONS: usages, expected
+
+actual interface <caret>I
+actual class C : I

idea/testData/multiModuleFindUsages/findActualInterface/jvm/jvm.results.txt

@@ -0,0 +1,2 @@
+[common.kt] Supertype 2 expect class C : I
+[jvm.kt] Supertype 5 actual class C : I

idea/testData/multiModuleFindUsages/findCommonSuperclass/common/common.kt

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtClass
+// OPTIONS: usages, expected
+
+expect open class O<caret>Class(i: Int)
+expect class Inheritor : OClass

idea/testData/multiModuleFindUsages/findCommonSuperclass/common/common.results.txt

@@ -0,0 +1,2 @@
+[common.kt] Supertype 5 expect class Inheritor : OClass
+[jvm.kt] Supertype 2 actual class Inheritor : OClass(42)

idea/testData/multiModuleFindUsages/findCommonSuperclass/jvm/jvm.kt

@@ -0,0 +1,2 @@
+actual open class OClass actual constructor(i: Int)
+actual class Inheritor : OClass(42)

idea/tests/org/jetbrains/kotlin/findUsages/FindUsagesMultiModuleTest.kt

@@ -22,6 +22,11 @@ import java.io.File
 
 class FindUsagesMultiModuleTest : AbstractFindUsagesMultiModuleTest() {
 
+    @Test
+    fun testFindActualInterface() {
+        doTest()
+    }
+
     @Test
     fun testFindCommonClassFromActual() {
         doTest()
@@ -37,6 +42,11 @@ class FindUsagesMultiModuleTest : AbstractFindUsagesMultiModuleTest() {
         doTest()
     }
 
+    @Test
+    fun testFindCommonSuperclass() {
+        doTest()
+    }
+
     @Test
     fun testFindImplFromHeader() {
         doTest()