[PATCH] Fix input validation issues in llvm-as/llvm-dis

[Lenar Safin]

In http://reviews.llvm.org/D9584#169069, @samsonov wrote:

> LGTM with one comment.


Alexey, could you please commit this? Thank you.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9584

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/