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dim
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2017-07-30T11:50:16.944446Z
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V 444
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

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