Simon Pilgrim a3a72b41de [InstCombine] Move SSE2/AVX2 arithmetic vector shift folding to instcombiner
As discussed in D11760, this patch moves the (V)PSRA(WD) arithmetic shift-by-constant folding to InstCombine to match the logical shift implementations.

Differential Revision: http://reviews.llvm.org/D11886

llvm-svn: 244495
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This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.