[llvm-commits] Changes to BumpPtrAllocator so it can be used for JITed function stubs and globals

[Reid Kleckner]

This parameterizes the BumpPtrAllocator over a slab allocation
strategy.  It defaults to using malloc, and there should be no
functional changes to other code.  It passes make check.  These
changes are needed so I don't have to write a second bump allocator in
the JIT memory manager, which can't use malloc since the memory must
be marked executable.  Please review!

Thanks,
Reid
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