Introduce interface method: VariableDescriptor.isConst

And several default implementations
Also take it into account in renderer

compiler/frontend/src/org/jetbrains/kotlin/resolve/DescriptorResolver.java

@@ -645,7 +645,8 @@ public class DescriptorResolver {
                     JetPsiUtil.safeName(variable.getName()),
                     CallableMemberDescriptor.Kind.DECLARATION,
                     toSourceElement(variable),
-                    false
+                    /* lateInit = */ false,
+                    /* isConst = */ false
             );
             // For a local variable the type must not be deferred
             type = getVariableType(propertyDescriptor, scope, variable, dataFlowInfo, false, trace);
@@ -743,7 +744,8 @@ public class DescriptorResolver {
                 JetPsiUtil.safeName(property.getName()),
                 CallableMemberDescriptor.Kind.DECLARATION,
                 toSourceElement(property),
-                modifierList != null && modifierList.hasModifier(JetTokens.LATE_INIT_KEYWORD)
+                modifierList != null && modifierList.hasModifier(JetTokens.LATE_INIT_KEYWORD),
+                modifierList != null && modifierList.hasModifier(JetTokens.CONST_KEYWORD)
         );
         wrapper.setProperty(propertyDescriptor);
 
@@ -1114,7 +1116,8 @@ public class DescriptorResolver {
                 name,
                 CallableMemberDescriptor.Kind.DECLARATION,
                 toSourceElement(parameter),
-                false
+                /* lateInit = */ false,
+                /* isConst = */ false
         );
         propertyWrapper.setProperty(propertyDescriptor);
         propertyDescriptor.setType(type, Collections.<TypeParameterDescriptor>emptyList(),

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/dynamicCalls.kt

@@ -95,7 +95,8 @@ object DynamicCallableDescriptors {
                 name,
                 CallableMemberDescriptor.Kind.DECLARATION,
                 SourceElement.NO_SOURCE,
-                false
+                /* lateInit = */ false,
+                /* isConst = */ false
         )
         propertyDescriptor.setType(
                 DynamicType,

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/util/FakeCallableDescriptorForObject.kt

@@ -61,4 +61,6 @@ public class FakeCallableDescriptorForObject(
     override fun getCompileTimeInitializer() = null
 
     override fun getSource(): SourceElement = classDescriptor.getSource()
+
+    override fun isConst(): Boolean = false
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyScriptClassMemberScope.kt

@@ -93,7 +93,8 @@ public class LazyScriptClassMemberScope protected constructor(
                 Name.identifier(ScriptDescriptor.LAST_EXPRESSION_VALUE_FIELD_NAME),
                 CallableMemberDescriptor.Kind.DECLARATION,
                 SourceElement.NO_SOURCE,
-                false
+                /* lateInit = */ false,
+                /* isConst = */ false
         )
 
         val returnType = scriptDescriptor.getScriptCodeDescriptor().getReturnType()
@@ -134,7 +135,8 @@ public class LazyScriptClassMemberScope protected constructor(
                 parameter.getName(),
                 CallableMemberDescriptor.Kind.DECLARATION,
                 SourceElement.NO_SOURCE,
-                false
+                /* lateInit = */ false,
+                /* isConst = */ false
         )
         propertyDescriptor.setType(
                 parameter.getType(),