Hi,
This patch adds mapping from dwarf2 register numbers to gdb ones. 
Surprisingly enough this important part was missing...
Can I commit to mainline and branch?

BTW Is there a reason why the place where all those set_gdbarch_whatever 
functions are called is named i386_gdbarch_init and not 
x86_64_gdbarch_init? Can I rename it?

Michal Ludvig
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