Recommit "Remove incorrect comment around truncateAVX512SetCCNoBWI; NFC" (2nd Try)

No bug here, just needed to revert to revert
8bd0e94 which had a bug.

Author: goldsteinn

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -53902,8 +53902,6 @@ static SDValue combineVectorSizedSetCCEquality(SDNode *SetCC, SelectionDAG &DAG,
 /// If we have AVX512, but not BWI and this is a vXi16/vXi8 setcc, just
 /// pre-promote its result type since vXi1 vectors don't get promoted
 /// during type legalization.
-/// NOTE: The element count check is to ignore operand types that need to
-/// go through type promotion to a 128-bit vector.
 static SDValue truncateAVX512SetCCNoBWI(EVT VT, EVT OpVT, SDValue LHS,
                                         SDValue RHS, ISD::CondCode CC, SDLoc DL,
                                         SelectionDAG &DAG,