Tor Browser nightly bundles crash on Linux 64bit systems

A couple of hours ago I hit a crash which is reproducible with the following backtrace:

Thread 1 "firefox" received signal SIGSEGV, Segmentation fault.
0x00007ffff3e2cbe1 in js::jit::SnapshotIterator::numAllocations (
    this=0x7fffffff6200)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:2159
2159	/home/debian/build/tor-browser/js/src/jit/JitFrames.cpp: Datei oder Verzeichnis nicht gefunden.
(gdb) bt
#0  0x00007ffff3e2cbe1 in js::jit::SnapshotIterator::numAllocations (
    this=0x7fffffff6200)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:2159
#1  js::jit::IonFrameStackDepthOp::IonFrameStackDepthOp (frame=..., 
    this=<optimized out>)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:421
#2  js::jit::TryNoteIterIon::TryNoteIterIon (frame=..., cx=0x7fffdf71d800, 
    this=0x7fffffff61c0)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:431
#3  js::jit::HandleExceptionIon (overrecursed=0x7fffffff60af, rfe=0x7fffffff6660, 
    frame=..., cx=0x7fffdf71d800)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:478
#4  js::jit::HandleException (rfe=0x7fffffff6660)
    at /home/debian/build/tor-browser/js/src/jit/JitFrames.cpp:853

We did not change anything recently JIT code related.