Replace llvm_asm in x86_64 code with asm

See merge request !56

Also removes the syscall1_clobber call, because `clone` now saves the
registers in the kernel anyway.

Add funmap2

See merge request !55

Merge rename-to-llvm-asm into master; bump to 0.2.0

See merge request !54

Implement auxiliary vector

See merge request !53

Add mmap2

See merge request !52

Simplify EXEC catching + add signal handling

See merge request !51

I have had a think, and these flags are pointless. Since this is a
microkernel, there should always be exactly one way to do something, and
it should be the most flexible and simplest to implement. And you can
already just set breakpoints on the address provided by the signal
handler, and we'll give the entrypoint as an address to the fexec call.

Not entirely a useful thing, one *could* also put a breakpoint on the
handler address... I'll need to think about this some more.

change seek sig to match posix - signed pos and result

See merge request !45

ptrace: stop on fexec

See merge request !50

Add missing match item for `PartialAllocStrategy::Greedy`.

See merge request !48

Add a more complex physalloc syscall.

See merge request !46

ptrace: Block on read, not on write

See merge request !47

Allow Mmio to work with const fn

See merge request !43

Allow Dma<[T]>

See merge request !42

Final few ptrace changes

See merge request !41

Ptrace overhaul & bitflags

See merge request !40