Bump clang to support `eosio::read_only` attribute#29

Merged

bogniq merged 4 commits intoeosiofrom

qy-read-only-action

May 24, 2021

Commits on Mar 30, 2021

change git branch for submodule clang
bogniq
committed

Commits on Apr 1, 2021

update commit hash of clang submodule
bogniq
committed

Commits on May 21, 2021