Pull in r336008 from upstream clang trunk:

  Request init/fini array on FreeBSD 12 and later

  Summary:

  It seems a bad idea to change the default in the middle of a release
  branch due to possible changes in global ctor / dtor ordering between
  .ctors and .init_array. With FreeBSD 11.0's release imminent lets
  change the default now for FreeBSD 12 (the current development
  stream) and later.

  FreeBSD rtld has supported .init_array / .fini_array for many years.
  As of Jan 1 2017 all supported FreeBSD releases and branches will
  have support.

  Reviewers: dim, brooks, arichardson

  Reviewed By: dim, brooks, arichardson

  Subscribers: bsdjhb, krytarowski, emaste, cfe-commits

  Differential Revision: https://reviews.llvm.org/D24867

Requested by:	jhb
MFC after:	3 days

contrib/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp

@@ -2375,6 +2375,8 @@ void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
   bool UseInitArrayDefault =
       getTriple().getArch() == llvm::Triple::aarch64 ||
       getTriple().getArch() == llvm::Triple::aarch64_be ||
+      (getTriple().getOS() == llvm::Triple::FreeBSD &&
+       getTriple().getOSMajorVersion() >= 12) ||
       (getTriple().getOS() == llvm::Triple::Linux &&
        ((!GCCInstallation.isValid() || !V.isOlderThan(4, 7, 0)) ||
         getTriple().isAndroid())) ||