See #144 for discussion.
- Add a new GlobalVar entity type both in Python and Rust.
- Define a UnaryGlobalVar instruction format containing a GlobalVar
reference.
- Add a globalvar.rs module defining the GlobalVarData with support for
'vmctx' and 'deref' global variable kinds.
Langref:
Add a section about global variables and the global_addr
instruction.
Parser:
Add support for the UnaryGlobalVar instruction format as well as
global variable declarations in the preamble.
The 'lib/cretonne' directory will be the new root of a stand-alone
cretonne crate containg both Python and Rust sources.
This is in preparation for publishing crates on crates.io.
