Lanai: Remove unused method

This was depending on the MachineFunction at MachineFunctionInfo
construction, which will soon be disallowed.

llvm/lib/Target/Lanai/LanaiMachineFunctionInfo.cpp

@@ -11,12 +11,3 @@
 using namespace llvm;
 
 void LanaiMachineFunctionInfo::anchor() {}
-
-Register LanaiMachineFunctionInfo::getGlobalBaseReg() {
-  // Return if it has already been initialized.
-  if (GlobalBaseReg)
-    return GlobalBaseReg;
-
-  return GlobalBaseReg =
-             MF.getRegInfo().createVirtualRegister(&Lanai::GPRRegClass);
-}

llvm/lib/Target/Lanai/LanaiMachineFunctionInfo.h

@@ -24,8 +24,6 @@ namespace llvm {
 class LanaiMachineFunctionInfo : public MachineFunctionInfo {
   virtual void anchor();
 
-  MachineFunction &MF;
-
   // SRetReturnReg - Lanai ABI require that sret lowering includes
   // returning the value of the returned struct in a register. This field
   // holds the virtual register into which the sret argument is passed.
@@ -41,13 +39,11 @@ class LanaiMachineFunctionInfo : public MachineFunctionInfo {
 
 public:
   explicit LanaiMachineFunctionInfo(MachineFunction &MF)
-      : MF(MF), VarArgsFrameIndex(0) {}
+      : VarArgsFrameIndex(0) {}
 
   Register getSRetReturnReg() const { return SRetReturnReg; }
   void setSRetReturnReg(Register Reg) { SRetReturnReg = Reg; }
 
-  Register getGlobalBaseReg();
-
   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
 };