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A little more resizing of buffers. apps/hex.subx is now building an
identical binary.
I'm now aborting on allocation failures. That requires disabling
a couple of tests. (I'm not quite confident enough of this decision to
delete them outright.) I want to treat all segfaults as bugs, and
machine code is no place to add boilerplate checks for return values of
standard library functions.
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Clean up some old TODOs related to our pre-mmap limitations.
Also caught another case of using the wrong comparison. When comparing
addresses, one must always use unsigned rather than signed jump instructions.
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Snapshot of incomplete work to have the memory allocator use `mmap` rather
than `brk`. C tests pass, but the SubX layers are still broken.
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Considering how much trouble a merge phase would be (commit 4978), it seems
simpler to just add the extra syntax for controlling the entry point of
the generated ELF binary.
But I wouldn't have noticed this if I hadn't taken the time to write out
the commit messages of 4976 and 4978.
Even if we happened to already have linked list primitives built, this
may still be a good idea considering that I'm saving quite a lot of code
in duplicated entrypoints.
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Support immediate operands in the data segment in all the ways we support
them in the code segment.
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