GlobalISel: Make LegalizerHelper primitives public

[arsenm]

Summary

I want to re-use widenScalarDst/moreElementsVectorDst directly.

[arsenm]

ping

[arsenm]

cc1cffbe097997da21ad6860b371dddbc922f228

llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h

public:
 
   /// Expose MIRBuilder so clients can set their own RecordInsertInstruction
   /// functions
   MachineIRBuilder &MIRBuilder;
 
   /// Expose LegalizerInfo so the clients can re-use.
   const LegalizerInfo &getLegalizerInfo() const { return LI; }
 
-private:
   /// Legalize a single operand \p OpIdx of the machine instruction \p MI as a
   /// Use by extending the operand's type to \p WideTy using the specified \p
   /// ExtOpcode for the extension instruction, and replacing the vreg of the
   /// operand in place.
   void widenScalarSrc(MachineInstr &MI, LLT WideTy, unsigned OpIdx,
                       unsigned ExtOpcode);
 
   /// Legalize a single operand \p OpIdx of the machine instruction \p MI as a
public:
   /// result elements, and replacing the vreg of the operand in place.
   void moreElementsVectorDst(MachineInstr &MI, LLT MoreTy, unsigned OpIdx);
 
   /// Legalize a single operand \p OpIdx of the machine instruction \p MI as a
   /// Use by producing a vector with undefined high elements, extracting the
   /// original vector type, and replacing the vreg of the operand in place.
   void moreElementsVectorSrc(MachineInstr &MI, LLT MoreTy, unsigned OpIdx);
 
+private:
   LegalizeResult
   widenScalarMergeValues(MachineInstr &MI, unsigned TypeIdx, LLT WideTy);
   LegalizeResult
   widenScalarUnmergeValues(MachineInstr &MI, unsigned TypeIdx, LLT WideTy);
   LegalizeResult
   widenScalarExtract(MachineInstr &MI, unsigned TypeIdx, LLT WideTy);
   LegalizeResult
   widenScalarInsert(MachineInstr &MI, unsigned TypeIdx, LLT WideTy);