More accurate error reporting

with type inference error for delegated properties
Add the constraints from completer if they don't lead to errors
except errors from upper bounds to improve diagnostics

compiler/testData/diagnostics/tests/inference/substitutions/delegationAndInference.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class A(val map: MutableMap<String, CharSequence>) {
+
+    var a: String by map.withDefault1 { "foo" }
+}
+
+fun <G> MutableMap<in String, in G>.get(thisRef: Any?, property: PropertyMetadata): G = throw Exception()
+
+fun <S> MutableMap<in String, in S>.set(thisRef: Any?, property: PropertyMetadata, value: S) {}
+
+fun <K, V> MutableMap<K, V>.withDefault1(default: (key: K) -> V): MutableMap<K, V> = this