Dominik Peteler authored Jul 09, 2021 and Marge Bot committed Oct 06, 2021

While the thread ids had been changed to 64 bit words in
e57b7cc6 the return type of the foreign
import function used to retrieve these ids - namely
'GHC.Conc.Sync.getThreadId' - was never updated accordingly.
In order to fix that this function returns now a 'CUULong'.

In addition to that the types used in the thread labeling subsystem were
adjusted as well and several format strings were modified throughout the
whole RTS to display thread ids in a consistent and correct way.

Fixes #16761