debuginfo does not pick user_regs_struct on x86_64
On RHEL6(x86_64), debuginfo does not pick user_regs_struct on x86_64.
# gdb /usr/lib/debug/lib/modules/2.6.32-71.el6.x86_64/vmlinux
GNU gdb (GDB) Red Hat Enterprise Linux (7.1-29.el6)
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Reading symbols from /usr/lib/debug/lib/modules/2.6.32-71.el6.x86_64/vmlinux...done.
(gdb) ptype struct user_regs_struct
No struct type named user_regs_struct.