RTEMS | Make the SPARC G6 global reg access an inline function (#5255)

[Chris Johns (@chris)]

Chris Johns created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5255

Assignee: Joel Sherrill

The following discussion from !488 should be addressed:

- [ ] @opticron started a [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/-/issues/5255
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