KT-12152 : constructor consistency analysis, base cases

compiler/testData/diagnostics/tests/constructorConsistency/nobacking.kt

@@ -0,0 +1,12 @@
+class My {
+
+    val x: Int
+        get() = 1
+
+    init {
+        // x has no backing field, so the call is safe
+        foo()
+    }
+
+    fun foo() {}
+}