rts/Printer.c: speed up '-Da' printer for 'LIBBFD' build
Patch switches from linear lookup in unordered array to a hash table lookup. When debugging GHC array contains 658_445 elements. Found performance gap when tried to debug blackholes. Signed-off-by:Sergei Trofimovich <siarheit@google.com> Reviewers: simonmar, austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1150
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