Add constructors to KtScope

- KtClassLikeSymbol.primaryConstructor was removed
- Constructors were removed from getCallableMembers because
constructors has no name (or special name `<init>`) and previous
implementation was incorrect
- KtScope.getAllSymbols returns constructors as before. Before it was
like this because of the incorrect implementation of getCallableMembers
- getConstructors has sence only for class scope,
for the rest cases it is empty

compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java

@@ -49,6 +49,11 @@ public class CompilerLightClassTestGenerated extends AbstractCompilerLightClassT
         runTest("compiler/testData/asJava/lightClasses/AnnotationClass.kt");
     }
 
+    @TestMetadata("Constructors.kt")
+    public void testConstructors() throws Exception {
+        runTest("compiler/testData/asJava/lightClasses/Constructors.kt");
+    }
+
     @TestMetadata("DataClassWithCustomImplementedMembers.kt")
     public void testDataClassWithCustomImplementedMembers() throws Exception {
         runTest("compiler/testData/asJava/lightClasses/DataClassWithCustomImplementedMembers.kt");
@@ -129,6 +134,11 @@ public class CompilerLightClassTestGenerated extends AbstractCompilerLightClassT
         runTest("compiler/testData/asJava/lightClasses/NonDataClassWithComponentFunctions.kt");
     }
 
+    @TestMetadata("OnlySecondaryConstructors.kt")
+    public void testOnlySecondaryConstructors() throws Exception {
+        runTest("compiler/testData/asJava/lightClasses/OnlySecondaryConstructors.kt");
+    }
+
     @TestMetadata("PublishedApi.kt")
     public void testPublishedApi() throws Exception {
         runTest("compiler/testData/asJava/lightClasses/PublishedApi.kt");