Remove stray `0`

src/llvm_backend_const.cpp

@@ -635,7 +635,7 @@ gb_internal Slice<LLVMValueRef> lb_construct_const_union_flatten_values(lbModule
 gb_internal LLVMValueRef lb_construct_const_union(lbModule *m, LLVMValueRef variant_value, Type *variant_type, Type *union_type) {
 #if 1
 	return nullptr;
-#else 0
+#else
 	Type *bt = base_type(union_type);
 	GB_ASSERT(bt->kind == Type_Union);
 	GB_ASSERT(lb_type(m, variant_type) == LLVMTypeOf(variant_value));