Make integer overflow less likely to happen (#7762)
The particular problematic code in #7762 was this: nat newSize = size - n; char *freeAddr = MBLOCK_ROUND_DOWN(bd->start); freeAddr += newSize * MBLOCK_SIZE; ^^^^^^^^^^^^^^^^^^^^^^ OVERFLOW!!! For good measure, I'm going to fix the bug twice. This patch fixes the class of bugs of this kind, by making sure that any expressions involving BLOCK_SIZE or MBLOCK_SIZE are promoted to unsigned long. In a separate patch, I'll fix a bunch of individual instances (including the one above).
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