[RISCV64] Add more MacroAssemblerRISCV64 helper infrastructure
Created attachment 445821 [details] Patch
Comment on attachment 445821 [details] Patch r=me
Committed r286592 (?): <https://commits.webkit.org/r286592> All reviewed patches have been landed. Closing bug and clearing flags on attachment 445821 [details].
<rdar://problem/86146644>