[Go] inline gotya

Reference:
https://vsdmars.blogspot.com/2020/02/golang-tooling-update.html

https://github.com/golang/go/wiki/CompilerOptimizations

Proposal:

https://go.googlesource.com/proposal/+/refs/heads/master/design/34481-opencoded-defers.md


Function Inlining: (compiled with -gcflags="-m")
Only short and simple functions are inlined.
To be inlined a function must contain less than ~40 expressions(80 AST nodes)  and does not contain complex things like 

• loops (for), 
• labels, 
• closures,
• panic's,
• recover's,
• select's,
• switch
• defer (now up-lifted thanks to Proposal: Low-cost defers through inline code, and extra funcdata to manage the panic case)
• go (goroutine creation)

Visualize with flag:

-gcflags="-d pctab=pctoinline"