Make constructor of JetTypeImpl private, introduce factory methods

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaClassDescriptor.kt

@@ -168,10 +168,9 @@ class LazyJavaClassDescriptor(
                 parameter -> TypeProjectionImpl(Variance.INVARIANT, parameter.getDefaultType())
             }
 
-            return JetTypeImpl(
-                    Annotations.EMPTY, classDescriptor.getTypeConstructor(),
-                    /* nullable =*/ false, parametersAsTypeProjections,
-                    classDescriptor.getMemberScope(parametersAsTypeProjections)
+            return JetTypeImpl.create(
+                    Annotations.EMPTY, classDescriptor,
+                    /* nullable =*/ false, parametersAsTypeProjections
             )
         }
 

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt

@@ -289,14 +289,14 @@ class LazyJavaTypeResolver(
                     val arguments = listOf(
                         TypeProjectionImpl(componentTypeProjection.projectionKind, eraseType(componentTypeProjection.type))
                     )
-                    return JetTypeImpl(
+                    return JetTypeImpl.create(
                         type.annotations, type.constructor, type.isMarkedNullable, arguments,
                         (type.constructor.declarationDescriptor as ClassDescriptor).getMemberScope(arguments)
                     )
                 }
 
                 val constructor = type.constructor
-                return JetTypeImpl(
+                return JetTypeImpl.create(
                     type.annotations, constructor, type.isMarkedNullable,
                     type.constructor.parameters.map {
                         parameter -> computeProjection(parameter, attr)

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/typeEnhacement/typeEnhancement.kt

@@ -102,7 +102,7 @@ private fun JetType.enhanceInflexible(qualifiers: (Int) -> JavaTypeQualifiers, i
         typeConstructor.parameters, enhancedArguments
     )
 
-    val enhancedType = JetTypeImpl(
+    val enhancedType = JetTypeImpl.create(
             newAnnotations,
             typeConstructor,
             enhancedNullability,