Refactor how we report reload results

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index b0b3a9c14df259a671d84fe1de55d7edb8ea5701..bc9689c2fe3bb0ad5daa9d5785f86ac52aa31c43 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -1357,13 +1357,13 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
   }
   if (do_reload) {
 #ifndef PRODUCT
+    JSONStream js;
     // Maybe adjust the rate of future reloads.
     isolate->MaybeIncreaseReloadEveryNStackOverflowChecks();
     // Issue a reload.
-    isolate->ReloadSources(true /* force_reload */);
-    const Error& error = Error::Handle(isolate->sticky_reload_error());
-    if (!error.IsNull()) {
-      FATAL1("*** Isolate reload failed: %s\n", error.ToErrorCString());
+    bool success = isolate->ReloadSources(&js, true /* force_reload */);
+    if (!success) {
+      FATAL1("*** Isolate reload failed:\n%s\n", js.ToCString());
     }
 #endif
   }