chakrashim: update Error.prepareStackTrace shim

deps/chakrashim/lib/chakra_shim.js

@@ -242,7 +242,17 @@
     function stackGetter() {
       if (!isPrepared) {
         const prep = Error.prepareStackTrace || prepareStackTrace;
-        stackSetter(prep(err, ensureStackTrace()));
+
+        // Prep can be re-entrant, of sorts, with regards to setting err.stack vs returning what err.stack should be
+        // We are trying to emulate the following behavior:
+        // Error.prepareStackTrace = function (err, frames) { err.stack = 1 } -> err.stack should be 1
+        // Error.prepareStackTrace = function (err, frames) { console.log("Called prepare") } -> err.stack should be undefined
+        // Error.prepareStackTrace = function (err, frames) { return 2 } -> err.stack should be 2
+        // Error.prepareStackTrace = function (err, frames) { err.stack = 1; return 2; } -> err.stack should be *1*
+        const preparedStack = prep(err, ensureStackTrace());
+        if (!isPrepared) {
+          stackSetter(preparedStack);
+        }
       }
 
       return currentStack;