[MC] Expose hasDefOfPhysReg(..) in the public MCInstrDesc interface.

[hctim]

Summary

Exposes hasDefOfPhysReg(..) to the public interface of MCInstrDesc. This only has one callee currently in MCInstrDesc::mayAffectControlFlow.

I'd like this to be public in order to use it in D39820 instead of implementing an identical function.

[hctim]

Abandoned this revision, merged it as part of D39820 on reccomendation from pcc.

include/llvm/MC/MCInstrDesc.h

public:
   unsigned char Size;            // Number of bytes in encoding.
   unsigned short SchedClass;     // enum identifying instr sched class
   uint64_t Flags;                // Flags identifying machine instr class
   uint64_t TSFlags;              // Target Specific Flag values
   const MCPhysReg *ImplicitUses; // Registers implicitly read by this instr
   const MCPhysReg *ImplicitDefs; // Registers implicitly defined by this instr
   const MCOperandInfo *OpInfo;   // 'NumOperands' entries about operands
   // Subtarget feature that this is deprecated on, if any
-  // -1 implies this is not deprecated by any single feature. It may still be 
+  // -1 implies this is not deprecated by any single feature. It may still be
   // deprecated due to a "complex" reason, below.
   int64_t DeprecatedFeature;
 
   // A complex method to determine is a certain is deprecated or not, and return
   // the reason for deprecation.
   bool (*ComplexDeprecationInfo)(MCInst &, const MCSubtargetInfo &,
                                  std::string &);
 
int findFirstPredOperandIdx() const {
     if (isPredicable()) {
       for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
         if (OpInfo[i].isPredicate())
           return i;
     }
     return -1;
   }
 
-private:
-
   /// \brief Return true if this instruction defines the specified physical
   /// register, either explicitly or implicitly.
   bool hasDefOfPhysReg(const MCInst &MI, unsigned Reg,
                        const MCRegisterInfo &RI) const;
 };
 
 } // end namespace llvm
 
 #endif