JS backend: fix missed variable declarations for tmps in class primary/default constructor

#KT-7864 Fixed

js/js.translator/testData/regression/cases/tmpInsidePrimaryConstructor.kt

@@ -0,0 +1,37 @@
+package foo
+
+val x: Int?
+    get() = null
+
+// Note: `x ?: 2` expression used to force to create tempary variable
+
+class A {
+    val a = x ?: 2
+}
+
+enum class E(val a: Int = 0) {
+    X(),
+    Y() {
+        val y = x ?: 4
+
+        override fun value() = y
+    },
+
+    val e = x ?: 3
+
+    open fun value() = e
+}
+
+open class B(val b: Int)
+
+class C : B(x ?: 6)
+
+
+fun box(): String {
+    assertEquals(2, A().a)
+    assertEquals(3, E.X.e)
+    assertEquals(4, E.Y.value())
+    assertEquals(6, C().b)
+
+    return "OK"
+}