use llir/llvm@v0.3.0-pre2 for code generation

[mewmew]

As an experiment, use the latest version of llir/llvm for code generation.

codegen test case output:

u@x1 ~/D/l/e/codegen> go test -v
=== RUN   TestBinaryFunction

define i32 @main() {
; <label>:0
	%1 = call i32 @add(i32 10, i32 10)
	ret i32 %1
}

define i32 @add(i32 %x, i32 %y) {
; <label>:0
	%1 = add i32 10, 10
	ret i32 %1
}

--- PASS: TestBinaryFunction (0.00s)
PASS
ok  	github.com/elz-lang/elz/codegen	0.001s

Updates #5.

P.S. the test case was also updated to include a ret instruction for the @main function.

[codecov-io]

Codecov Report

Merging #113 into master will decrease coverage by 0.88%.
The diff coverage is 52.63%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   73.46%   72.58%   -0.89%     
==========================================
  Files           5        5              
  Lines         196      197       +1     
==========================================
- Hits          144      143       -1     
- Misses         52       53       +1     
- Partials        0        1       +1

Impacted Files	Coverage Δ
codegen/codegen.go	61.29% <52.63%> (-1.76%)	⬇️

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[dannypsnl]

Thanks for your PR, I would need to take some time to compare c-binding & llir, basically, I think v0.3 is good for me, and work with c-binding is painful, have a nice day!

[mewmew]

Thanks for your PR, I would need to take some time to compare c-binding & llir, basically, I think v0.3 is good for me, and work with c-binding is painful, have a nice day!

Of course!

Let me know if you reach any stumbling blocks and we could try to fix them together. Have a great day :)

[dannypsnl]

@mewmew Can you help me change the target branch to llir so I can merge it and compare with master branch? (And I can fix the conflict at llir branch) Thanks

[mewmew]

@mewmew Can you help me change the target branch to llir so I can merge it and compare with master branch? (And I can fix the conflict at llir branch) Thanks

Of course!

[mewmew]

Closed in favour of #115