On NetBSD/amd64 9.99.98 when running MiniBrowser (or surf and probably
any other WebKitGTK+ web browsers) WebKitWebProcess crashes with:

```
$ gdb -core WebKitWebProcess.core /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess
Reading symbols from /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess...
(No debugging symbols found in /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess)
[New process 8556]
[New process 28884]
[New process 19013]
[New process 13540]
[New process 26379]
[New process 24988]
Core was generated by `WebKitWebProcess'.
Program terminated with signal SIGABRT, Aborted.
#0  0x000078a9e17a4d5a in _lwp_kill () from /usr/lib/libc.so.12
[Current thread is 1 (process 8556)]
(gdb) bt
#0  0x000078a9e17a4d5a in _lwp_kill () from /usr/lib/libc.so.12
#1  0x000078a9e17a521e in abort () at /usr/src/lib/libc/stdlib/abort.c:74
#2  0x000078a9e7425cfe in WTFCrashWithInfoImpl(int, char const*, char const*, int, unsigned long, unsigned long, unsigned long, unsigned long) () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#3  0x000078a9e72217e3 in JSC::sanitizeStackForVM(JSC::VM&) () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#4  0x000078a9e789ab55 in ?? () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#5  0x000078a9e722775c in ?? () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#6  0x000078a9e7229034 in JSC::VM::create(JSC::HeapType, WTF::RunLoop*) () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#7  0x000078a9ec6724d0 in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#8  0x000078a9eba710bd in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#9  0x000078a9eb72c202 in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#10 0x000078a9eb875675 in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#11 0x000078a9eb876c20 in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#12 0x000078a9e73cc1a4 in ?? () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#13 0x000078a9e7404689 in ?? () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#14 0x000078a9e7404fb9 in ?? () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#15 0x000078a9e2e54bdf in g_main_context_dispatch () from /usr/pkg/lib/libglib-2.0.so.0
#16 0x000078a9e2e54f88 in g_main_context_iterate.constprop () from /usr/pkg/lib/libglib-2.0.so.0
#17 0x000078a9e2e55283 in g_main_loop_run () from /usr/pkg/lib/libglib-2.0.so.0
#18 0x000078a9e7405110 in WTF::RunLoop::run() () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
#19 0x000078a9ed702270 in ?? () from /usr/pkg/lib/libwebkit2gtk-4.0.so.37
#20 0x00000000dce00b5e in ?? ()
#21 0x00007f7f7920c3a8 in ?? () from /usr/libexec/ld.elf_so
#22 0x0000000000000003 in ?? ()
#23 0x00007f7fff501358 in ?? ()
#24 0x00007f7fff501389 in ?? ()
#25 0x00007f7fff50138c in ?? ()
#26 0x0000000000000000 in ?? ()
```

Investigate what is going on.
