wip-rtl native closure creation

[Stefan Israelsson Tampe <stefan.itampe@gmail.com>]

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Hi,

I was thinking how to mix rtl-VM and native compilation with respect to
closure creation

currently in the code we layout the program as

((nfree :16 | flags:8 | ?:7 | tag:0), code, freevar1 ....)

Then at closure creation we just set first slot, the code to point to a
relative adress relative
ip e.g. we just need 24 bits, and finally the free-vars is handled.

The thing to think of here is how to introduce a reference to native code,
if we add an extra slot
in the program data structure as currently down in the old program (not rtl
programs) definition, then
we must do some heavy magic to map vm-code to native code. Probably it is
best to have the first
qword / dword in the code to be 0 or the native adress e.g. I propose to
add that feature to the rtl-branch.

/Stefan

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