RTEMS | x86_64: Enable and add support for FP tasks (!95)

[Sebastian Huber (@sebhub)]

Sebastian Huber commented on a discussion on cpukit/score/cpu/x86_64/include/rtems/score/cpu.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/95#note_108129

 >  
 >  #define CPU_SIMPLE_VECTORED_INTERRUPTS FALSE
 >  #define CPU_ISR_PASSES_FRAME_POINTER FALSE
 > -#define CPU_HARDWARE_FP FALSE
 > +#define CPU_HARDWARE_FP TRUE
 >  #define CPU_SOFTWARE_FP FALSE
 > -#define CPU_ALL_TASKS_ARE_FP FALSE
 > +#define CPU_ALL_TASKS_ARE_FP TRUE

Yes, it would be all handled by `_CPU_Context_switch()`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/95#note_108129
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