[PATCH] Fix check for noalias function

[Tobias Güntner]

Hi!

isNoAliasFn returns 'false' for the call instruction in this example:

declare noalias i8* @test()
define void @foo() {
   call i8* @test()
   ret void
}

isNoAliasFn checks if the function has a noalias attribute. I suppose it 
should check the return value instead. I've attached a patch.

Regards,
Tobias
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