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

[Alexey Samsonov]

REPOSITORY
  rL LLVM

================
Comment at: tools/llvm-as/llvm-as.cpp:67
@@ -66,2 +66,3 @@
       int Len = IFN.length();
-      if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
+      if (Len >= 3 && IFN[Len-3] == '.' && IFN[Len-2] == 'l' &&
+          IFN[Len-1] == 'l') {
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Can you use StringRef::endswith(".ll") instead?

http://reviews.llvm.org/D9584

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