Rework TypeSubstituion, now it applies to types instead of constructors

Also introduce IndexedParametersSubstitution

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/JavaResolverUtils.java

@@ -141,6 +141,7 @@ public class JavaResolverUtils {
             typeSubstitutionContext.put(originalToAltTypeParameter.getKey().getTypeConstructor(),
                                         new TypeProjectionImpl(originalToAltTypeParameter.getValue().getDefaultType()));
         }
+        // TODO: Use IndexedParametersSubstitution here instead of map creation
         return TypeSubstitutor.create(typeSubstitutionContext);
     }
 }

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/JavaSyntheticExtensionsScope.kt

@@ -271,7 +271,7 @@ class JavaSyntheticExtensionsScope(storageManager: StorageManager) : JetScope by
         init {
             val classTypeParams = ownerClass.typeConstructor.parameters
             val typeParameters = ArrayList<TypeParameterDescriptor>(classTypeParams.size())
-            val typeSubstitutor = DescriptorSubstitutor.substituteTypeParameters(classTypeParams, TypeSubstitutor.EMPTY, this, typeParameters)
+            val typeSubstitutor = DescriptorSubstitutor.substituteTypeParameters(classTypeParams, TypeSubstitution.EMPTY, this, typeParameters)
 
             val propertyType = typeSubstitutor.safeSubstitute(type, Variance.INVARIANT)
             val receiverType = typeSubstitutor.safeSubstitute(ownerClass.defaultType, Variance.INVARIANT)