Drop CodegenBinding#enclosingClassDescriptor()

compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java

@@ -856,10 +856,13 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                             "constructor: " + constructor.getValueParameters().size();
 
                     MutableClosure closure = ImplementationBodyCodegen.this.context.closure;
-                    if (closure != null && closure.getCaptureThis() != null) {
-                        Type type = typeMapper.mapType(enclosingClassDescriptor(bindingContext, descriptor));
-                        iv.load(0, classAsmType);
-                        iv.getfield(classAsmType.getInternalName(), CAPTURED_THIS_FIELD, type.getDescriptor());
+                    if (closure != null) {
+                        ClassDescriptor captureThis = closure.getCaptureThis();
+                        if (captureThis != null) {
+                            iv.load(0, classAsmType);
+                            Type type = typeMapper.mapType(captureThis);
+                            iv.getfield(classAsmType.getInternalName(), CAPTURED_THIS_FIELD, type.getDescriptor());
+                        }
                     }
 
                     int parameterIndex = 1; // localVariable 0 = this

compiler/backend/src/org/jetbrains/jet/codegen/binding/CalculatedClosure.java

@@ -31,9 +31,6 @@ import java.util.List;
 import java.util.Map;
 
 public interface CalculatedClosure {
-    @Nullable
-    ClassDescriptor getEnclosingClass();
-
     @Nullable
     ResolvedCall<ConstructorDescriptor> getSuperCall();
 

compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java

@@ -100,11 +100,6 @@ public class CodegenBinding {
         return asmTypeForScriptDescriptor(bindingContext, scriptDescriptor);
     }
 
-    public static ClassDescriptor enclosingClassDescriptor(BindingContext bindingContext, ClassDescriptor descriptor) {
-        CalculatedClosure closure = bindingContext.get(CLOSURE, descriptor);
-        return closure == null ? null : closure.getEnclosingClass();
-    }
-
     @NotNull
     public static ClassDescriptor anonymousClassForFunction(
             @NotNull BindingContext bindingContext,
@@ -157,8 +152,8 @@ public class CodegenBinding {
             return false;
         }
 
-        ClassDescriptor enclosing = enclosingClassDescriptor(bindingContext, classDescriptor);
-        if (enclosing == null) {
+        MutableClosure closure = bindingContext.get(CLOSURE, classDescriptor);
+        if (closure == null || closure.getEnclosingClass() == null) {
             return false;
         }
 

compiler/backend/src/org/jetbrains/jet/codegen/binding/MutableClosure.java

@@ -50,7 +50,6 @@ public final class MutableClosure implements CalculatedClosure {
     }
 
     @Nullable
-    @Override
     public ClassDescriptor getEnclosingClass() {
         return enclosingClass;
     }