[Patch][Clang/CodeGen] Fixes invalid shufflevector instruction

[Pflanzer, Moritz]

Hello,

The attached patch fixes bug 23800 ( https://llvm.org/bugs/show_bug.cgi?id=23800 ).
There existed a case where the index operand from extractelement was directly used to create a shufflevector mask. Since the index can be of any integral type but the mask must only contain 32 bit integers a 64 bit index operand led to an assertion error later on.

I would appreciate if someone could review and eventually apply my changes.

Best regards,

Moritz

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