dillon1000/react

[rust] port inline_use_memo

Ports InlineUseMemo to Rust, this is the only missing transform pass on the 
pipeline up through constant propagation. I wanted to finish this so that we 
could do benchmarking of the early phase of compilation. UseMemo does a bunch of 
rewriting so it seemed worth comparing performance. 

Included: 

* Add swc -> estree and estree -> HIR conversions for arrow functions and call 
expressions 

* Add HIR definition for labeled terminals and call expressions 

* Utility for inlining one function into another — note that this requires 
remapping InstrIx operands since instruction indices will change. An alternative 
would be to store all the instructions for both outer/inner functions in the 
same array, in which case we wouldn't need to remap. 

* Helpers for mutably iterating the operands of an instruction or terminal. 

* The actual inline_use_memo() function. The overall logic is similar, i just 
had to slightly shuffle the order of operations to satisfy the borrow checker.