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rts: Fix Arena blocks accounting for MBlock sized allocations

Daniel Gröber (dxld) requested to merge DanielG/ghc:rts-fix-arena-accounting into master

When requesting more than BLOCKS_PER_MBLOCK blocks allocGroup can return a different number of blocks than requested. Here we use the number of requested blocks, however arenaFree will subtract the actual number of blocks we got from arena_blocks (possibly) resulting in a negative value and triggering ASSERT(arena_blocks >= 0).

  • are either individually buildable or squashed
  • have commit messages which describe what they do
  • add a testcase to the testsuite.
Edited by Daniel Gröber (dxld)

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