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Eliminate thunk in 'IfaceTyCon'

Hannes Siebenhandl requested to merge fendor/ghc:wip/sharing-ifacetyconinfo into master

This MR closes #24516 (closed)

Heap analysis showed that IfaceTyCon retains a thunk to IfaceTyConInfo, defeating the sharing of the most common instances of IfaceTyConInfo. We make sure the indirection is removed by adding bang patterns to IfaceTyCon. Furthermore, we force the thunk introduced by mkIfaceTyCon right after deserialising.

Edited by Hannes Siebenhandl

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