Trivial program crashes Prepack

[NTillmann]

I guess something goes very wrong with Prepack's internal handling of stack overflows.
I expect a nice error message since we even have a configurable maxStackDepth bound.

function f() { f(); }
f();

=>

unexpected Invariant Violation:
This is likely a bug in Prepack, not your code. Feel free to open an issue on GitHub.:
Invariant Violation:
This is likely a bug in Prepack, not your code. Feel free to open an issue on GitHub.
    at invariant (/Users/nikolait/git/prepack/lib/invariant.js:24:15)
    at Realm.popContext (/Users/nikolait/git/prepack/lib/realm.js:393:28)
    at LexicalEnvironment.executeSources (/Users/nikolait/git/prepack/lib/environment.js:1028:18)
    at Serializer._execute (/Users/nikolait/git/prepack/lib/serializer/serializer.js:96:40)
    at statistics.total.measure (/Users/nikolait/git/prepack/lib/serializer/serializer.js:162:23)
    at PerformanceTracker.measure (/Users/nikolait/git/prepack/lib/statistics.js:91:14)
    at Serializer.init (/Users/nikolait/git/prepack/lib/serializer/serializer.js:156:35)
    at prepackSources (/Users/nikolait/git/prepack/lib/prepack-standalone.js:80:33)
    at prepackFileSync (/Users/nikolait/git/prepack/lib/prepack-node.js:198:48)
    at run (/Users/nikolait/git/prepack/lib/prepack-cli.js:535:24)