Reland r13188, r13194, r13256 (Deferred formatting of error stack trace during GC).

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 0563443b8bdf1248a2b3bf78bd837bceb406c6d2..e898edb538477710a095bc4ac817a8dbe3ff0502 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1862,8 +1862,7 @@ v8::Local<Value> v8::TryCatch::StackTrace() const {
     if (!raw_obj->IsJSObject()) return v8::Local<Value>();
     i::HandleScope scope(isolate_);
     i::Handle<i::JSObject> obj(i::JSObject::cast(raw_obj), isolate_);
-    i::Handle<i::String> name =
-        isolate_->factory()->LookupOneByteSymbol(STATIC_ASCII_VECTOR("stack"));
+    i::Handle<i::String> name = isolate_->factory()->stack_symbol();
     if (!obj->HasProperty(*name)) return v8::Local<Value>();
     i::Handle<i::Object> value = i::GetProperty(obj, name);
     if (value.is_null()) return v8::Local<Value>();