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Now that we can fully specify extload legality, we can declare them legal for the PMOVSX/PMOVZX instructions. This for instance enables a DAGCombine to fire on code such as (and (<zextload-equivalent> ...), <redundant mask>) to turn it into: (zextload ...) as seen in the testcase changes. There is one regression, in widen_load-2.ll: we're no longer able to do store-to-load forwarding with illegal extload memory types. This will be addressed separately. Differential Revision: http://reviews.llvm.org/D6533 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226676 91177308-0d34-0410-b5e6-96231b3b80d8
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