[FIR] Properly load isExpect flag for constructors

^KT-57635 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/K2Tests.kt

@@ -53,7 +53,7 @@ class CustomK2Tests : KGPBaseTest() {
     }
 
     @GradleTest
-    @DisplayName("HMPP compilation without JS target. KT-57376")
+    @DisplayName("HMPP compilation without JS target. KT-57376, KT-57635")
     fun testHmppCompilationWithoutJsTarget(gradleVersion: GradleVersion) {
         with(project("k2-mpp-without-js", gradleVersion)) {
             val taskToExecute = ":compileIntermediateMainKotlinMetadata"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/k2-mpp-without-js/src/commonMain/kotlin/kt57635.common.kt

@@ -0,0 +1,4 @@
+// ISSUE: KT-57635
+package kt57635
+
+expect class A()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/k2-mpp-without-js/src/intermediateMain/kotlin/kt57635.intermediate.kt

@@ -0,0 +1,4 @@
+// ISSUE: KT-57635
+package kt57635
+
+actual class A actual constructor()