RTEMS | cpukit/include/rtems/score: Use uintptr_t for TLS DTV generation_number (!1082)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion on cpukit/include/rtems/score/tls.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1082#note_150801

 >  
 >  typedef struct {
 >    /*
 > -   * FIXME: Not sure if the generation number type is correct for all

I agree with Samuel's explanation here. Using `uintptr_t` correctly aligns the DTV `generation_number` with the native machine word size for the target architecture, which directly resolves the concern in the original `FIXME`. An updated commit message capturing this ABI alignment will be perfect. In my view, it's good to go once that's updated."

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1082#note_150801
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