pushed upstream as https://bugs.webkit.org/show_bug.cgi?id=114978)
Seems to fix xombrero/surf crashes on amd64, and seems to magically make
webkit sort-of usable (ie dead-slow, but js seems to work) on powerpc.
(symptom : ** Message: console message: undefined @0: RangeError: Maximum
call stack size exceeded.)
Note : webkit still fails to build on mips64* and hppa. sigh.
ok jasper@