KT-10322, KT-10646, KT-10647:

- update diagnostic to (supposedly) more useful
- also report IMPLICIT_CAST_TO_ANY if expected type is DONT_CARE
 (effectively "no expected type" for lambda expression).

compiler/testData/diagnostics/tests/controlStructures/kt10322.kt

@@ -0,0 +1,12 @@
+fun <T> run(block: () -> T) : T = block()
+
+fun test1() {
+    run {
+        if (true) {
+            <!INVALID_IF_AS_EXPRESSION, IMPLICIT_CAST_TO_ANY!>if (true) {}<!>
+        }
+        else {
+            <!IMPLICIT_CAST_TO_ANY!>1<!>
+        }
+    }
+}