Add StringRef::compare_numeric and use it to sort TableGen register records.

This means that our Registers are now ordered R7, R8, R9, R10, R12, ...
Not R1, R10, R11, R12, R2, R3, ...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104745 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CodeGenTarget.cpp

@@ -159,6 +159,7 @@ void CodeGenTarget::ReadRegisters() const {
   std::vector<Record*> Regs = Records.getAllDerivedDefinitions("Register");
   if (Regs.empty())
     throw std::string("No 'Register' subclasses defined!");
+  std::sort(Regs.begin(), Regs.end(), LessRecord());
 
   Registers.reserve(Regs.size());
   Registers.assign(Regs.begin(), Regs.end());
@@ -175,6 +176,7 @@ const std::string &CodeGenRegister::getName() const {
 
 void CodeGenTarget::ReadSubRegIndices() const {
   SubRegIndices = Records.getAllDerivedDefinitions("SubRegIndex");
+  std::sort(SubRegIndices.begin(), SubRegIndices.end(), LessRecord());
 }
 
 void CodeGenTarget::ReadRegisterClasses() const {