Add assert to isPhysicalRegister and isVirtualRegister to fail when

passed the special 'register' 0.

llvm-svn: 11842

llvm/include/llvm/Target/MRegisterInfo.h

@@ -141,12 +141,14 @@ public:
   /// isPhysicalRegister - Return true if the specified register number is in
   /// the physical register namespace.
   static bool isPhysicalRegister(unsigned Reg) {
+    assert(Reg && "this is not a register!";
     return Reg < FirstVirtualRegister;
   }
 
   /// isVirtualRegister - Return true if the specified register number is in
   /// the virtual register namespace.
   static bool isVirtualRegister(unsigned Reg) {
+    assert(Reg && "this is not a register!";
     return Reg >= FirstVirtualRegister;
   }