[PATCH] [x86] Add a ZERO_EXTEND_VECTOR_INREG DAG node and use it when widening vector types to be legal and a ZERO_EXTEND node is encountered.

[hfinkel at anl.gov]

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Comment at: lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp:745
@@ +744,3 @@
+  int ExtLaneScale = NumSrcElements / NumElements;
+  int EndianOffset = TLI.isBigEndian() ? ExtLaneScale - 1 : 0;
+  for (int i = 0; i < NumElements; ++i)
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Is the big-endian case covered by one of the existing regression tests?

http://reviews.llvm.org/D4405