[Bug 253335] emulators/qemu-user-static php segfault building devel/pear for armv7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253335

--- Comment #8 from Mark Johnston <markj at FreeBSD.org> ---
Using truss on the host I can see that we are mprotecting the last page
(containing the address in question) of that range to PROT_READ | PROT_EXEC. 
It doesn't show up in qemu's strace output, so presumably this is something
internal to qemu.  The only syscall which looks relevant here is a
sysarch(ARM_SYNC_ICACHE), but it looks like qemu treats that as a no-op...

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