gdb: register access corrupts rbx and x87 state

read_registers puts rbp in GDB slot 1, which is rbx (x86_64_target.rs#L202). gdb shows the wrong rbx. Any register write sends that value back, so set $rax = 1 also sets rbx to rbp.
write_registers builds CommonFpu with ..Default::default() (x86_64_target.rs#L272). Any register write resets ST0-7, FSW and FTW. read_registers also never reports x87 or segment registers.

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