Stack alloc

[Therzok]

No description provided.

[Therzok]

This is the most important optimization, as we invoke this pretty often in MD.

[Therzok]

60c3220

Means:
Faster allocation - not on the heap
No more GValueArray wrapper on the heap - plus, no more finalization for it.

[Therzok]

60c3220
199e461

Result in this diff:
https://gist.github.com/Therzok/af03aa73dfde604a9f57c0e14db0d589

[alanmcgovern]

LGTM! Let's merge em after a day or two of local testing to make sure there aren't any oopses! It all looks fine to me though!

[alanmcgovern]

Also one thing to keep in mind - there are no guarantees about the contents of stackalloced memory. It looks like we always fully initialize all memory we allocate this way, but if you ever want allocate an extra byte for a null terminator (or whatever) do remember to explicitly write null to that byte!

[Therzok]

The stackallocs are mostly GLib.Value/Utf8String via marshal, so it's safe to assume we don't get uninitialized memory.