RTEMS | sparc/include/.../cpuimpl.h: Correct global file scope register use (!488)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/488#note_122997


So...this is technically correct as register g6 is reserved by the SPARC ABI for OS use and the header declaration allows direct access to g6 as if it were a variable, but this particular type of declaration is fragile since it uses a GCC extension which could go away in the future (especially given how the `register` keyword has been declining over time).

A better long-term solution is to convert this declaration to a little snippet of inline assembler that stores into or retrieves from g6 as necessary.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/488#note_122997
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