[PATCH] D17299: [ASTReader] Report error when accessing corrupt record data

[Vedant Kumar via cfe-commits]

vsk created this revision.
vsk added reviewers: rsmith, benlangmuir.
vsk added a subscriber: cfe-commits.

If we try to read a corrupt pch, we can easily assert-fail or trigger invalid
memory accesses when manipulating ASTReader::RecordData objects. This problem
is easy enough to diagnose when assertions are enabled, but can cause trouble
otherwise.

Emit an error diagnostic when we detect a bad RecordData access.

http://reviews.llvm.org/D17299

Files:
  include/clang/Serialization/ASTReader.h
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTReaderStmt.cpp

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