[PATCH] [X86, AVX] adjust tablegen patterns to generate better code for scalar insertion into zero vector (PR23073)

[Craig Topper]

================
Comment at: test/CodeGen/X86/vector-shuffle-256-v4.ll:846
@@ -845,3 +845,3 @@
 ; ALL:       # BB#0:
-; ALL-NEXT:    vxorpd %xmm1, %xmm1, %xmm1
+; ALL:         vxorpd %xmm1, %xmm1, %xmm1
 ; ALL-NEXT:    vmovsd {{.*#+}} xmm0 = xmm0[0],xmm1[1]
----------------
Why is this not ALL-NEXT anymore?

http://reviews.llvm.org/D8794

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