False positive on OOM error (#212)

gc callback can happen between init and set
this causes a confusing OOM crash because max mem is 0 at this point, so if the callback is hit, then the isolate will terminate no matter what.

Co-authored-by: nightpool <nightpool@users.noreply.github.com>

ext/mini_racer_extension/mini_racer_extension.cc

@@ -467,6 +467,14 @@ nogvl_context_eval(void* arg) {
 
     IsolateData::Init(isolate);
 
+    if (eval_params->max_memory > 0) {
+        IsolateData::Set(isolate, IsolateData::MEM_SOFTLIMIT_MAX, eval_params->max_memory);
+        if (!isolate_info->added_gc_cb) {
+            isolate->AddGCEpilogueCallback(gc_callback);
+            isolate_info->added_gc_cb = true;
+        }
+    }
+
     MaybeLocal<Script> parsed_script;
 
     if (eval_params->filename) {
@@ -491,14 +499,6 @@ nogvl_context_eval(void* arg) {
         result->message->Reset(isolate, trycatch.Exception());
     } else {
         // parsing successful
-        if (eval_params->max_memory > 0) {
-            IsolateData::Set(isolate, IsolateData::MEM_SOFTLIMIT_MAX, eval_params->max_memory);
-            if (!isolate_info->added_gc_cb) {
-            isolate->AddGCEpilogueCallback(gc_callback);
-                isolate_info->added_gc_cb = true;
-            }
-        }
-
         if (eval_params->marshal_stackdepth > 0) {
             StackCounter::SetMax(isolate, eval_params->marshal_stackdepth);
         }