JS: fix scope of function generated for primary constructor. See KT-15678

js/js.translator/src/org/jetbrains/kotlin/js/translate/declaration/ClassTranslator.kt

@@ -75,7 +75,8 @@ class ClassTranslator private constructor(
         val scope = context().getScopeForDescriptor(descriptor)
         val context = context().newDeclaration(descriptor)
 
-        val constructorFunction = context.createRootScopedFunction(descriptor)
+        val constructorFunction = descriptor.unsubstitutedPrimaryConstructor?.let { context.getFunctionObject(it) } ?:
+                                  context.createRootScopedFunction(descriptor)
         constructorFunction.name = context.getInnerNameForDescriptor(descriptor)
         context.addDeclarationStatement(constructorFunction.makeStmt())
         val enumInitFunction = if (descriptor.kind == ClassKind.ENUM_CLASS) createEnumInitFunction() else null

js/js.translator/testData/box/nameClashes/constructorLocalVar.kt

@@ -0,0 +1,25 @@
+var log = ""
+
+inline fun f(x: Int): Int {
+    val result = x * 2
+    log += "f($x)"
+    return result
+}
+
+fun bar() = 10
+
+class Test {
+    val value: Int
+
+    init {
+        val x = 3
+        val y = f(bar())
+        value = x + y
+    }
+}
+
+fun box(): String {
+    val test = Test()
+    if (test.value != 23) return "fail: ${test.value}"
+    return "OK"
+}