Compress MCRegisterInfo register name tables.
Compress MCRegisterInfo register name tables.

Store (debugging) register names as offsets into a string table instead
of as char pointers.

git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@157449 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx