Fix "Descriptor of property not available in binding context" assert for declarations in bodies

idea/testData/quickfix/override/typeMismatchOnOverride/afterObjectInsideBody.kt

@@ -0,0 +1,13 @@
+// "Change 'prop' type to 'Int'" "true"
+// ERROR: Null can not be a value of a non-null type Int
+trait Test<T> {
+    val prop : T
+}
+
+class Other {
+    fun doTest() {
+        val some = object: Test<Int> {
+            override val prop: Int = null
+        }
+    }
+}

idea/testData/quickfix/override/typeMismatchOnOverride/beforeObjectInsideBody.kt

@@ -0,0 +1,13 @@
+// "Change 'prop' type to 'Int'" "true"
+// ERROR: Null can not be a value of a non-null type Int
+trait Test<T> {
+    val prop : T
+}
+
+class Other {
+    fun doTest() {
+        val some = object: Test<Int> {
+            override val <caret>prop = null
+        }
+    }
+}