[Bug 224917] www/firefox: bus error on stable/10 with 57.0.3,1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224917

--- Comment #2 from Jilles Tjoelker <jilles at FreeBSD.org> ---
I rebuilt firefox-57.0.3,1 from a (slightly more recent) ports tree with SVN
r457360 reverted. This seems to run stably for 20 minutes and the disassembly
of the corresponding part of libxul.so shows that clang 4.0 has used two
regular mov instructions instead of SSE:

  ceac73:       75 9b                   jne    ceac10
<_ZN7mozilla3ipc14MessageChannel5ClearEv+0x90>
  ceac75:       49 8b b6 10 01 00 00    mov    0x110(%r14),%rsi
  ceac7c:       48 8b 7d c8             mov    -0x38(%rbp),%rdi
  ceac80:       e8 9b bf 00 00          callq  cf6c20
<_ZNSt3__16__treeINS_12__value_typeImN7mozilla3ipc14MessageChannel13PromiseHolderEEENS_19__map_value_compareImS6_NS_4lessImEELb1EEENS_9allocatorIS6_EEE7destroyEPNS_11__tree_nodeIS6_PvEE>
  ceac85:       49 c7 86 18 01 00 00    movq   $0x0,0x118(%r14)
  ceac8c:       00 00 00 00 
  ceac90:       4d 89 be 08 01 00 00    mov    %r15,0x108(%r14)
  ceac97:       49 c7 86 10 01 00 00    movq   $0x0,0x110(%r14)
  ceac9e:       00 00 00 00 
  ceaca2:       49 c7 46 38 00 00 00    movq   $0x0,0x38(%r14)
  ceaca9:       00 
  ceacaa:       49 8b 7e 30             mov    0x30(%r14),%rdi
  ceacae:       48 85 ff                test   %rdi,%rdi
  ceacb1:       74 06                   je     ceacb9
<_ZN7mozilla3ipc14MessageChannel5ClearEv+0x139>

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