[PATCH] Fix LexicalScope reset in LiveDebugVariables.cpp

[Marcello Maggioni]

Hello,

I noticed by inspection that in LiveDebugVariables.cpp we don't actually reset the LexicalScope when we clear() the LDVImpl object.
This might create problems if we rely on clearing the object.
This patch fixes that.

http://reviews.llvm.org/D5952

Files:
  lib/CodeGen/LiveDebugVariables.cpp
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