Report conflicting overloads for constructors

- It's worked almost fine but diagnostics were filtered out by
  positioning strategy.

- Also a couple of "put" calls to Multimap are replaced by "putValues"
  within OverloadResolver, that is more semantically correct.

- Note that constructors of top-level classes are handled when processing
  package, it helps to figure out if there are clashes with top-level
  functions that have the same name.

- But constructors of different classes are not reported as
  overloads because containing classes has the same name and will be
  reported as redeclaration.

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

@@ -10547,6 +10547,18 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("redeclarations.kt")
+            public void testRedeclarations() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/redeclarations.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("redeclarationsOfConstructorsIgnored.kt")
+            public void testRedeclarationsOfConstructorsIgnored() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/redeclarationsOfConstructorsIgnored.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("resolvePropertyInitializerWithoutPrimary.kt")
             public void testResolvePropertyInitializerWithoutPrimary() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/resolvePropertyInitializerWithoutPrimary.kt");