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a test case. We also miscompile this test case which is showing a serious flaw in the single-input v8i16 shuffle code. I've left the specific instruction checks FIXME-ed out until I can address the bug in the single-input code, but I wanted to separate out a significant functionality change to produce correct code from a very simple and targeted crasher fix. The miscompile problem stems from keeping track of inputs by value rather than by index. As a consequence of doing this, we can't reliably update those inputs because they might swap and we can't detect this without copying the mask. The blend code now uses indices for the input lists and this seems strictly better. It also should make it easier to sort things and do other cleanups. I think the time has come to simplify The Great Lambda here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214914 91177308-0d34-0410-b5e6-96231b3b80d8
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