[Bug 234887] [exp-run] with Clang modified to emit DWARF4 by default

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234887

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Fri Jan 25 14:46:14 UTC 2019
New revision: 343429
URL: https://svnweb.freebsd.org/changeset/base/343429

Log:
  clang: default to DWARF 4 as of FreeBSD 13

  FreeBSD previously defaulted to DWARF 2 because several tools (gdb,
  ctfconvert, etc.) did not support later versions.  These have either
  been fixed or are deprecated.

  Note that gdb 6 still exists but has been moved out of $PATH into
  /usr/libexec and is intended only for use by crashinfo(8).  The kernel
  build sets the DWARF version explicitly via -gdwarf2, so this should
  have no effect there.

  PR:           234887 [exp-run]
  Reviewed by:  markj
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D17930

Changes:
  head/contrib/llvm/tools/clang/lib/Driver/ToolChains/FreeBSD.cpp
  head/contrib/llvm/tools/clang/lib/Driver/ToolChains/FreeBSD.h

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