Eagerly format traces in captureStackTrace

test/mjsunit/stack-traces.js

Index: test/mjsunit/stack-traces.js
diff --git a/test/mjsunit/stack-traces.js b/test/mjsunit/stack-traces.js
index b9574a14b6a36c8296fd5f19d14935313a2d5c8f..a30a51548dfc40dbf8207501904f1eb6ef2daef5 100644
--- a/test/mjsunit/stack-traces.js
+++ b/test/mjsunit/stack-traces.js
@@ -380,3 +380,9 @@ assertEquals(undefined, error.stack);
 // Check that repeated trace collection does not crash.
 error = new Error();
 Error.captureStackTrace(error);
+
+// Check that exceptions thrown within prepareStackTrace throws an exception.
+Error.prepareStackTrace = function(e, frames) { throw 42; }
+
+var x = {}
+assertThrows(() => Error.captureStackTrace(x));