[llvm] [AMDGPU] Fix error in #88512. (PR #92770)

[Matt Arsenault via llvm-commits]

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@@ -4168,7 +4168,7 @@ bool AMDGPULegalizerInfo::legalizeCTLZ_ZERO_UNDEF(MachineInstr &MI,
 
   auto ShiftAmt = B.buildConstant(S32, 32u - NumBits);
   auto Extend = B.buildAnyExt(S32, {Src}).getReg(0u);
-  auto Shift = B.buildLShr(S32, {Extend}, ShiftAmt);
+  auto Shift = B.buildShl(S32, {Extend}, ShiftAmt);
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arsenm wrote:

Probably doesn't need the {}s 

https://github.com/llvm/llvm-project/pull/92770