[X86] Fix missing check of rotate <-> shift equivilence (Issue 108722)

Previous code was checking that rotate and shift where equivilent when
transforming shift -> rotate but not the other way around.

Closes #108767

Author: goldsteinn

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -3489,7 +3489,7 @@ unsigned X86TargetLowering::preferedOpcodeForCmpEqPiecesOfOperand(
 
   // We prefer rotate for vectors of if we won't get a zext mask with SRL
   // (PreferRotate will be set in the latter case).
-  if (PreferRotate || VT.isVector())
+  if (PreferRotate || !MayTransformRotate || VT.isVector())
     return ShiftOpc;
 
   // Non-vector type and we have a zext mask with SRL.

llvm/test/CodeGen/X86/cmp-shiftX-maskX.ll

@@ -997,8 +997,8 @@ define i1 @shr_to_rotate_eq_i32_s5(i32 %x) {
 define i32 @issue108722(i32 %0) {
 ; CHECK-NOBMI-LABEL: issue108722:
 ; CHECK-NOBMI:       # %bb.0:
-; CHECK-NOBMI-NEXT:    movzbl %dil, %ecx
-; CHECK-NOBMI-NEXT:    shrl $24, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %ecx
+; CHECK-NOBMI-NEXT:    roll $24, %ecx
 ; CHECK-NOBMI-NEXT:    xorl %eax, %eax
 ; CHECK-NOBMI-NEXT:    cmpl %edi, %ecx
 ; CHECK-NOBMI-NEXT:    sete %al