Delay call context destruction (#26798)

src/core/lib/surface/call.cc

@@ -151,6 +151,11 @@ struct grpc_call {
   }
 
   ~grpc_call() {
+    for (int i = 0; i < GRPC_CONTEXT_COUNT; ++i) {
+      if (context[i].destroy) {
+        context[i].destroy(context[i].value);
+      }
+    }
     gpr_free(static_cast<void*>(const_cast<char*>(final_info.error_string)));
   }
 
@@ -554,11 +559,6 @@ static void destroy_call(void* call, grpc_error_handle /*error*/) {
   for (ii = 0; ii < c->send_extra_metadata_count; ii++) {
     GRPC_MDELEM_UNREF(c->send_extra_metadata[ii].md);
   }
-  for (i = 0; i < GRPC_CONTEXT_COUNT; i++) {
-    if (c->context[i].destroy) {
-      c->context[i].destroy(c->context[i].value);
-    }
-  }
   if (c->cq) {
     GRPC_CQ_INTERNAL_UNREF(c->cq, "bind");
   }