Refactor resolution of double colon expression LHS

Try resolving the LHS only when it looks (PSI-wise) like it could represent a
type element. This, for example, allows "illegal selector" error to be reported
on weird expressions like '""?.""::class'.

Also remove expression text from the "illegal selector" diagnostic, it's not
needed and can screw up the error message if the text is too big

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -8607,6 +8607,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("illegalSelectorCallableReference.kt")
+            public void testIllegalSelectorCallableReference() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/incompleteCode/illegalSelectorCallableReference.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("inExpr.kt")
             public void testInExpr() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/incompleteCode/inExpr.kt");