[Dlang-internal] Proposal: New Switch -vcg-ast to output the lowered AST

[Stefan Koch via Dlang-internal]

Hello fellow compiler hackers,

In order to debug the inliner I have implemented a switch that 
prints out the AST after all semantic processing is done.
Using the infra-structure that is already provided by hdrgen.
This has already let me to make a few improvements to the hdrgen.
For example if-else chains will no longer infinitely indent to 
the left.
Or Literals of EnumType will be printed by name rather then as 
cast(MyEnum)38943U.

I do think this is very worthwhile to have.

And would be happy to hear some opinions from you.

PS. I am aware that the printout of enum definitions is now 
broken; I know howto fix it and will do so shotly.

Lastly I should like the PR:
https://github.com/dlang/dmd/pull/6556

Cheers,
Stefan