Improved diagnostic message for JS heap out of memory

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 3e52cc0e6fd61cf0607644ae4cde52316685010e..1e196720f5168bb917035812cbd45eeaf31dfc68 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -241,7 +241,7 @@ void i::FatalProcessOutOfMemory(const char* location) {
 
 // When V8 cannot allocated memory FatalProcessOutOfMemory is called.
 // The default fatal error handler is called and execution is stopped.
-void i::V8::FatalProcessOutOfMemory(const char* location, bool take_snapshot) {
+void i::V8::FatalProcessOutOfMemory(const char* location, bool is_heap_oom) {
   i::Isolate* isolate = i::Isolate::Current();
   char last_few_messages[Heap::kTraceRingBufferSize + 1];
   char js_stacktrace[Heap::kStacktraceBufferSize + 1];
@@ -303,7 +303,9 @@ void i::V8::FatalProcessOutOfMemory(const char* location, bool take_snapshot) {
     PrintF("\n<--- Last few GCs --->\n%s\n", first_newline);
     PrintF("\n<--- JS stacktrace --->\n%s\n", js_stacktrace);
   }
-  Utils::ApiCheck(false, location, "Allocation failed - process out of memory");
+  Utils::ApiCheck(false, location, is_heap_oom
+                  ? "Allocation failed - JavaScript heap out of memory"
+                  : "Allocation failed - process out of memory");
   // If the fatal error handler returns, we stop execution.
   FATAL("API fatal error handler returned after process out of memory");
 }