internal: Add generalized "noinline" attribute support.

[briansmith]

There are some functions that we never want to be (cross-language) inlined, and we expect to add more. Make it easier to add more, and make it easier to extend this capability to more C compilers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c4742e0) 96.02% compared to head (1cf34e0) 96.02%.
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main    #1898   +/-   ##
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  Coverage   96.02%   96.02%           
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  Files         136      136           
  Lines       20776    20776           
  Branches      226      226           
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  Hits        19950    19950           
  Misses        792      792           
  Partials       34       34           

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[briansmith]

The original submission of this PR used standard attirbute syntax [[clang::noinline]] when compiling with clang. But, apparently clang doesn't like mixing __attribute__((...)) syntax with the standard attribute syntax, which was being done in the ADX code. So, I change RING_NOINLINE to use __attribute__((...)) syntax for clang too.