[PATCH] Avoid crash reading bitcode files with bad abbrev record (bug 20485)

[David Callahan]

REPOSITORY
  rL LLVM

================
Comment at: tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp:415
@@ +414,3 @@
+      if(Stream.ReadAbbrevRecord())
+        return Error("malformed bitcode file");
+
----------------
rafael wrote:
> Ah, so you have a diagnostic here. Please move it down to where the problem is first detected. That should allow you to print a better message.
I chose to put the diagnostic here because that was more consistent with prior use of the API and in particular there are other clients in  llvm/tools/clang (with a separate revision) that have different diagnostic needs.

http://reviews.llvm.org/D7003

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