[PATCH] Improve #pragma comment(lib) support

[Rui Ueyama]

-    Consumer.HandleDependentLibrary(Arg);
+    // If the argument does not end in .lib, automatically add the suffix.
This
+    // matches the behavior of MSVC.
+    std::string ArgStr = Arg;
+    StringRef End = Arg.substr( Arg.size() - 4 );

Looks like it's not safe if Arg.size() < 4.
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