fixing IDEA crash on stub building

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

@@ -68,7 +68,7 @@ public class FunctionCodegen {
             if (isAbstract) flags |= ACC_ABSTRACT;
 
             final MethodVisitor mv = v.newMethod(fun, flags, jvmSignature.getName(), jvmSignature.getDescriptor(), null, null);
-            if(kind != OwnerKind.TRAIT_IMPL) {
+            if(kind != OwnerKind.TRAIT_IMPL && v.generateCode()) {
                 int start = functionDescriptor.getReceiverParameter().exists() ? 1 : 0;
                 for(int i = 0; i != paramDescrs.size(); ++i) {
                     AnnotationVisitor annotationVisitor = mv.visitParameterAnnotation(i + start, "Ljet/typeinfo/JetParameterName;", true);

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

@@ -802,9 +802,9 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                 v.newField(myClass, Opcodes.ACC_PRIVATE, "$typeInfo", "Ljet/typeinfo/TypeInfo;", null, null);
 
                 MethodVisitor mv = v.newMethod(myClass, Opcodes.ACC_PUBLIC, "getTypeInfo", "()Ljet/typeinfo/TypeInfo;", null, null);
-                mv.visitCode();
                 InstructionAdapter iv = null;
                 if (v.generateCode()) {
+                    mv.visitCode();
                     iv = new InstructionAdapter(mv);
                     String owner = typeMapper.mapType(descriptor.getDefaultType(), OwnerKind.IMPLEMENTATION).getInternalName();
                     iv.load(0, JetTypeMapper.TYPE_OBJECT);