[PATCH] clang-modernize: Reset LoopConvert's TU tracking info per TU

[Edwin Vane]

Hi tareqsiraj, arielbernal,

The LoopConvert transform makes use of data structures it builds up over
the course of transforming a TU. Until now, these data structures
weren't being cleared out before the next TU was being processed.

This resolves PR17253.

http://llvm-reviews.chandlerc.com/D1758

Files:
  clang-modernize/LoopConvert/LoopActions.cpp
  clang-modernize/LoopConvert/LoopActions.h
  clang-modernize/LoopConvert/LoopConvert.cpp
  clang-modernize/LoopConvert/LoopConvert.h
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