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

[Simon Pilgrim via llvm-commits]

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@@ -276,6 +276,15 @@ def X86xor_flag  : SDNode<"X86ISD::XOR",  SDTBinaryArithWithFlags,
 def X86and_flag  : SDNode<"X86ISD::AND",  SDTBinaryArithWithFlags,
                           [SDNPCommutative]>;
 
+def SDTX86ShiftWithFlags : SDTypeProfile<2, 1, [
+  SDTCisSameAs<0, 2>,
+  SDTCisVT<1, i32>,
+]>;
+
+def X86shl : SDNode<"X86ISD::SHL", SDTX86ShiftWithFlags, [SDNPInGlue]>;
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RKSimon wrote:

Why can't you use SDTBinaryArithWithFlags?

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