[wip] Add support for RISC-V

[brandond]

• Copy of Add support for RISC-V #7778 to kick off a new build, since I can't push to that fork.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bbafb86) 47.12% compared to head (141294d) 17.87%.
Report is 1 commits behind head on master.

❗ Current head 141294d differs from pull request most recent head c5df083. Consider uploading reports for the commit c5df083 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #8341       +/-   ##
===========================================
- Coverage   47.12%   17.87%   -29.26%     
===========================================
  Files         148       94       -54     
  Lines       15674     8715     -6959     
===========================================
- Hits         7387     1558     -5829     
+ Misses       7089     6921      -168     
+ Partials     1198      236      -962     

Flag	Coverage Δ
inttests	?
unittests	17.87% <ø> (ø)

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see 122 files with indirect coverage changes

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