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rts: Allocate MBlocks with MAP_TOP_DOWN on Windows

Ben Gamari requested to merge wip/win32-high-heap into master

As noted in #18991 (closed), we would previously allocate heap in low memory. Due to this the linker, which typically needs low memory, would end up competing with the heap. In longer builds we end up running out of low memory entirely, leading to linking failures.

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