[PATCH] [mips][FastISel] Specify which types we handle for integer extension.

[Vasileios Kalintiris]

This patch is part of the revision http://reviews.llvm.org/D6765 which I will not be able to commit for the next few days. However, because this fixes some failures in our out-of-tree MIPS buildbots, I created a new review request that contains only the fix.


http://reviews.llvm.org/D9243

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