[PATCH] PrettyStackTrace guards around ASTReader

[Jordan Rose]

Hi rsmith, benlangmuir,

What do you think about adding a very trivial PrettyStackTrace guard around the entry points to ASTReader, to remind compiler developers to clear their module cache when they hit a crash here? Would this be the right way to do that?

http://reviews.llvm.org/D6138

Files:
  lib/Serialization/ASTReader.cpp
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