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Augment StgCase with allocation info flag for #16064

This patch is PART1 of Implementation Plan described here: https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/rts/haskell-execution/heap-checks

We extend StgCase with extra allocation boolean flag, with the following meaning:

  • Flag = True <=> each alternative is responsible for adding a heap check for its own allocation
  • Flag = False <=> alternatives do not do heap checks. Instead their allocation (or the max of allocation across the branches) is combined into the heap-check for the parent

By "parent" we mean the expression of which the case is a part.

We will then consult this info to determine the GcPlan in codegen.

Main ticket: #16064

Edited by Simon Peyton Jones