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The megablock allocator does not currently check that after aligning the free region if it still has enough space to actually do the allocation. This causes it to return a memory region which it didn't fully allocate itself. Even worse, it can cause it to return a block with a region that will be present in two allocation pools. This causes if you're lucky an error from the OS that you're committing memory that has never been reserved, or causes random heap corruption. This change makes it consider the alignment as well. Test Plan: ./validate , testcase testmblockalloc Reviewers: bgamari, erikd, simonmar Reviewed By: simonmar Subscribers: rwbarton, carter Differential Revision: https://phabricator.haskell.org/D5363
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