[llvm] [X86] Remove redundant TEST after shifts when count is non-zero (PR #169069)

[via llvm-commits]

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@@ -689,3 +689,52 @@ let Predicates = [HasBMI2, HasEGPR] in {
   defm SHRX : ShiftX_Pats<srl, "_EVEX">;
   defm SHLX : ShiftX_Pats<shl, "_EVEX">;
 }
+
+def SDTX86ShiftWithFlags : SDTypeProfile<2, 1, [
+  SDTCisSameAs<0, 2>,
+  SDTCisVT<1, i32>,
+]>;
+
+def X86shl : SDNode<"X86ISD::SHL", SDTX86ShiftWithFlags, [SDNPInGlue]>;
+def X86srl : SDNode<"X86ISD::SRL", SDTX86ShiftWithFlags, [SDNPInGlue]>;
+def X86sra : SDNode<"X86ISD::SRA", SDTX86ShiftWithFlags, [SDNPInGlue]>;
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GrumpyPigSkin wrote:

Moved 

https://github.com/llvm/llvm-project/pull/169069