Feature/formally parse riscv isa #2966

Job	Run time
build-mingw (windows-2022, mingw64)	2m 2s
build-macos (macos-13, gcc@11)	1m 11s
build-mingw (windows-2022, ucrt64)	1m 59s
build-macos (macos-13)	34s
build-macos (macos-13, gcc@12)	55s
build-linux (jammy, 96b_carbon)	32s
build-mingw (windows-2022, clang64)	2m 16s
build-macos (macos-14)	23s
build-macos (macos-13, gcc@13)	1m 16s
build-linux (jammy, blackpill-f401cc)	39s
build-macos (macos-latest)	22s
build-linux (jammy, blackpill-f401ce)	35s
build-linux (jammy, blackpill-f411ce)	32s
build-msvc (meson, windows-2022)	1m 9s
size-diff	41s
build-linux (jammy, bluepill)	31s
build-linux (jammy, ctxlink)	36s
build-macos (macos-13, gcc@14)	57s
build-linux (jammy, f072)	33s
build-macos (macos-14, gcc@11)	52s
build-linux (jammy, f3)	35s
build-macos (macos-14, gcc@12)	36s
build-linux (jammy, f4discovery)	51s
build-macos (macos-14, gcc@13)	32s
build-linux (jammy, hydrabus)	42s
build-macos (macos-14, gcc@14)	43s
build-linux (jammy, launchpad-icdi)	37s
build-linux (jammy, native)	37s
build-linux (jammy, native-uncommon)	33s
build-linux (jammy, native-st-clones)	33s
build-linux (jammy, native-riscv)	30s
build-linux (jammy, native-remote)	36s
build-linux (jammy, stlink)	37s
build-linux (jammy, stlinkv3)	44s
build-linux (jammy, swlink)	40s
	28m 1s

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