JIT can and can_s.
Add const_i64_32 to list of ops we can JIT.

The emitter already knew how, just not the JIT graph builder.
JIT hllize.

Also mark hllizefor as invokish, for future JITting.
Some platforms use amd64 to refer to x86_64
Initial work on async process spawning.

With this, it actually does spawn a process, though the result or any
errors are not yet handed back, and there's no I/O with the process
yet.
Schedule async proc exit and error callbacks.
Merge pull request #124 from carbin/bsd-users-are-people-too

Some platforms use amd64 to refer to x86_64
Another attempt at Mac OS X support

I'd say there has to be a better way to detect
x64 support, but I don't know it yet.
Preparation for async read from stdout/stderr.
Async process stdout/stderr async reads.

This means tapping either (or both) output stream will now work out.
Try to guess MAST output buffer sizes.

Can avoid a decent number of reallocs in large compilation units.
Add unless_n and if_n

Note that NaN is regarded as truthy
Add clone as a reprconv function

This is /slightly/ less efficient than the interpreted version,
since that version can store the allocated object directly
to a register, and the function cannot.
Mention --enable-jit as a Configure.pl option
Implement killing an async process.
moarvm jit can deletekey now!
JIT scwbenable / scwbdisable
JIT assignunchecked and assign
JIT getlexstatic_o and getlexperinvtype_o
Bump linenoise to latest version.