[commit: ghc] circleci-centos's head updated: testsuite: Mark tickets identified in #15467 as broken (b1e2846)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

Branch 'circleci-centos' now includes:

     c00d2f5 hadrian: Drop nix build script
     4773b43 Fix minor mistake in comment about data decls.
     6c98b9f testsuite: Use explicit -e in sed command
     ba85e38 CircleCI: Add configurations for Centos 7 and Debian 9
     b6ccabe utils/gen-dll: Bump containers upper bound
     515633e rts: Disable fallthrough attribute when compiling with Clang
     b1e2846 testsuite: Mark tickets identified in #15467 as broken