[Bug 225330] clang bug can incorrectly enable or disable interrupts on amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225330

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: brooks
Date: Fri Apr 20 22:46:23 UTC 2018
New revision: 467849
URL: https://svnweb.freebsd.org/changeset/ports/467849

Log:
  Merge r332833 from FreeBSD HEAD.

  This should ensure clang does not use pushf/popf sequences to
  save and restore flags, avoiding problems with unrelated flags (such as
  the interrupt flag) being restored unexpectedly.

  PR:           225330

Changes:
  head/devel/llvm60/Makefile
  head/devel/llvm60/files/clang/patch-fsvn-r332833-clang
  head/devel/llvm60/files/patch-fsvn-r332833

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