GlobalISel: Remove unsigned variant of SrcOp

Force using Register.

One downside is the generated register enums require explicit
conversion.

llvm-svn: 364194
diff --git a/llvm/lib/Target/ARM/ARMCallLowering.cpp b/llvm/lib/Target/ARM/ARMCallLowering.cpp
index c298576..fa54a9e 100644
--- a/llvm/lib/Target/ARM/ARMCallLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMCallLowering.cpp
@@ -90,27 +90,27 @@
                        MachineInstrBuilder &MIB, CCAssignFn *AssignFn)
       : ValueHandler(MIRBuilder, MRI, AssignFn), MIB(MIB) {}
 
-  unsigned getStackAddress(uint64_t Size, int64_t Offset,
+  Register getStackAddress(uint64_t Size, int64_t Offset,
                            MachinePointerInfo &MPO) override {
     assert((Size == 1 || Size == 2 || Size == 4 || Size == 8) &&
            "Unsupported size");
 
     LLT p0 = LLT::pointer(0, 32);
     LLT s32 = LLT::scalar(32);
-    unsigned SPReg = MRI.createGenericVirtualRegister(p0);
-    MIRBuilder.buildCopy(SPReg, ARM::SP);
+    Register SPReg = MRI.createGenericVirtualRegister(p0);
+    MIRBuilder.buildCopy(SPReg, Register(ARM::SP));
 
-    unsigned OffsetReg = MRI.createGenericVirtualRegister(s32);
+    Register OffsetReg = MRI.createGenericVirtualRegister(s32);
     MIRBuilder.buildConstant(OffsetReg, Offset);
 
-    unsigned AddrReg = MRI.createGenericVirtualRegister(p0);
+    Register AddrReg = MRI.createGenericVirtualRegister(p0);
     MIRBuilder.buildGEP(AddrReg, SPReg, OffsetReg);
 
     MPO = MachinePointerInfo::getStack(MIRBuilder.getMF(), Offset);
     return AddrReg;
   }
 
-  void assignValueToReg(unsigned ValVReg, unsigned PhysReg,
+  void assignValueToReg(Register ValVReg, Register PhysReg,
                         CCValAssign &VA) override {
     assert(VA.isRegLoc() && "Value shouldn't be assigned to reg");
     assert(VA.getLocReg() == PhysReg && "Assigning to the wrong reg?");
@@ -118,17 +118,17 @@
     assert(VA.getValVT().getSizeInBits() <= 64 && "Unsupported value size");
     assert(VA.getLocVT().getSizeInBits() <= 64 && "Unsupported location size");
 
-    unsigned ExtReg = extendRegister(ValVReg, VA);
+    Register ExtReg = extendRegister(ValVReg, VA);
     MIRBuilder.buildCopy(PhysReg, ExtReg);
     MIB.addUse(PhysReg, RegState::Implicit);
   }
 
-  void assignValueToAddress(unsigned ValVReg, unsigned Addr, uint64_t Size,
+  void assignValueToAddress(Register ValVReg, Register Addr, uint64_t Size,
                             MachinePointerInfo &MPO, CCValAssign &VA) override {
     assert((Size == 1 || Size == 2 || Size == 4 || Size == 8) &&
            "Unsupported size");
 
-    unsigned ExtReg = extendRegister(ValVReg, VA);
+    Register ExtReg = extendRegister(ValVReg, VA);
     auto MMO = MIRBuilder.getMF().getMachineMemOperand(
         MPO, MachineMemOperand::MOStore, VA.getLocVT().getStoreSize(),
         /* Alignment */ 1);
@@ -298,7 +298,7 @@
 
   bool isArgumentHandler() const override { return true; }
 
-  unsigned getStackAddress(uint64_t Size, int64_t Offset,
+  Register getStackAddress(uint64_t Size, int64_t Offset,
                            MachinePointerInfo &MPO) override {
     assert((Size == 1 || Size == 2 || Size == 4 || Size == 8) &&
            "Unsupported size");
@@ -315,7 +315,7 @@
     return AddrReg;
   }
 
-  void assignValueToAddress(unsigned ValVReg, unsigned Addr, uint64_t Size,
+  void assignValueToAddress(Register ValVReg, Register Addr, uint64_t Size,
                             MachinePointerInfo &MPO, CCValAssign &VA) override {
     assert((Size == 1 || Size == 2 || Size == 4 || Size == 8) &&
            "Unsupported size");
@@ -336,14 +336,14 @@
     }
   }
 
-  void buildLoad(unsigned Val, unsigned Addr, uint64_t Size, unsigned Alignment,
+  void buildLoad(Register Val, Register Addr, uint64_t Size, unsigned Alignment,
                  MachinePointerInfo &MPO) {
     auto MMO = MIRBuilder.getMF().getMachineMemOperand(
         MPO, MachineMemOperand::MOLoad, Size, Alignment);
     MIRBuilder.buildLoad(Val, Addr, *MMO);
   }
 
-  void assignValueToReg(unsigned ValVReg, unsigned PhysReg,
+  void assignValueToReg(Register ValVReg, Register PhysReg,
                         CCValAssign &VA) override {
     assert(VA.isRegLoc() && "Value shouldn't be assigned to reg");
     assert(VA.getLocReg() == PhysReg && "Assigning to the wrong reg?");