[Bug 219139] [exp-run] Against projects/clang500-import branch

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219139

--- Comment #17 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Sun Jul 30 11:50:17 UTC 2017
New revision: 321719
URL: https://svnweb.freebsd.org/changeset/base/321719

Log:
  Pull in r309503 from upstream clang trunk (by Richard Smith):

    PR33902: Invalidate line number cache when adding more text to
    existing buffer.

    This led to crashes as the line number cache would report a bogus
    line number for a line of code, and we'd try to find a nonexistent
    column within the line when printing diagnostics.

  This fixes an assertion when building the graphics/champlain port.

  Reported by:  antoine, kwm
  PR:           219139

Changes:
  head/contrib/llvm/tools/clang/lib/Lex/ScratchBuffer.cpp

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