Use TableGen to emit information for dwarf register numbers.

This makes DwarfRegNum to accept list of numbers instead.
Added three different "flavours", but only slightly tested on x86-32/linux.
Please check another subtargets if possible,


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43997 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMRegisterInfo.h

@@ -117,6 +117,8 @@ public:
   // Exception handling queries.
   unsigned getEHExceptionRegister() const;
   unsigned getEHHandlerRegister() const;
+
+  int getDwarfRegNum(unsigned RegNum) const;
 };
 
 } // end namespace llvm