Remove the return type check for llvm.readio.  This check is done for all functions and is not needed here. Simplify the pointer type check per Chris's suggestions.
Remove the return type check for llvm.readio.  This check is done for all
functions and is not needed here.
Simplify the pointer type check per Chris's suggestions.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@12945 91177308-0d34-0410-b5e6-96231b3b80d8

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