[X86] remove derived method w/ same impl as base

Summary:
While looking into issues with IfConverter, I noticed that
X86InstrInfo::isUnpredicatedTerminator matched its overriden
implementation in TargetInstrInfo::isUnpredicatedTerminator.

Reviewers: craig.topper, hfinkel, MaskRay, echristo

Reviewed By: MaskRay, echristo

Subscribers: hiraditya, llvm-commits, srhines

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62749

llvm/lib/Target/X86/X86InstrInfo.cpp

@@ -2863,17 +2863,6 @@ unsigned X86::getSwappedVCMPImm(unsigned Imm) {
   return Imm;
 }
 
-bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr &MI) const {
-  if (!MI.isTerminator()) return false;
-
-  // Conditional branch is a special case.
-  if (MI.isBranch() && !MI.isBarrier())
-    return true;
-  if (!MI.isPredicable())
-    return true;
-  return !isPredicated(MI);
-}
-
 bool X86InstrInfo::isUnconditionalTailCall(const MachineInstr &MI) const {
   switch (MI.getOpcode()) {
   case X86::TCRETURNdi:

llvm/lib/Target/X86/X86InstrInfo.h

@@ -305,7 +305,6 @@ public:
                                  const X86InstrFMA3Group &FMA3Group) const;
 
   // Branch analysis.
-  bool isUnpredicatedTerminator(const MachineInstr &MI) const override;
   bool isUnconditionalTailCall(const MachineInstr &MI) const override;
   bool canMakeTailCallConditional(SmallVectorImpl<MachineOperand> &Cond,
                                   const MachineInstr &TailCall) const override;