Trying to guess why EWS is failing in bug #210302, I noticed that generate_offset_extractor.rb is missing a build dependency for llint/WebAssembly.asm.
Sadly, this doesn't explain the build failure in that bug, because that patch modifies several other files that should cause this script to run. But let's fix it anyway.
My working dir is pretty dirty right now. The fix I will upload when ready is:
index 38ae6ce11a89..82311f380df2 100644
@@ -192,6 +192,7 @@ set(LLINT_ASM
Created attachment 414392 [details]
Committed r269933: <https://trac.webkit.org/changeset/269933>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 414392 [details].