Ensure there is some space on JS stack available for bootstrapping.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 17f480c1d5a4c249da957814e7937e0b3941b2e6..f3d047f0a484dc9f1eb09f74d2d56f1755885d9e 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -2772,15 +2772,15 @@ void Isolate::CheckDetachedContextsAfterGC() {
 }
 
 
-bool StackLimitCheck::JsHasOverflowed() const {
+bool StackLimitCheck::JsHasOverflowed(uintptr_t gap) const {
   StackGuard* stack_guard = isolate_->stack_guard();
 #ifdef USE_SIMULATOR
   // The simulator uses a separate JS stack.
   Address jssp_address = Simulator::current(isolate_)->get_sp();
   uintptr_t jssp = reinterpret_cast<uintptr_t>(jssp_address);
-  if (jssp < stack_guard->real_jslimit()) return true;
+  if (jssp - gap < stack_guard->real_jslimit()) return true;
 #endif  // USE_SIMULATOR
-  return GetCurrentStackPosition() < stack_guard->real_climit();
+  return GetCurrentStackPosition() - gap < stack_guard->real_climit();
 }