Generate constructor without parameters if primary constructor has only parameters with default values

#KT-3085 Fixed

compiler/testData/compileKotlinAgainstKotlin/DefaultConstructorA.kt

@@ -0,0 +1 @@
+class A(val a: Int = 1)

compiler/testData/compileKotlinAgainstKotlin/DefaultConstructorB.kt

@@ -0,0 +1,5 @@
+package bbb
+
+fun main(args: Array<String>) {
+    A()
+}