gh-121404: split compile.c into compile.c and codegen.c

[iritkatriel]

This is The Big Split.

In order to preserve as much git history as possible, I did a git mv Python/compile.c Python/codegen.c. Then I copied the compiler code from codegen.c to compile.c.

We end up with:

% wc -l Python/codegen.c Python/compile.c 6142 Python/codegen.c 1665 Python/compile.c 

So a complex file of 1.6K lines, and a relatively simple file with 6K lines.

• Issue: split compiler.c into compiler and codegen #121404

[JelleZijlstra]

FYI there are some compile errors (I'll do an actual review later)

[picnixz]

Can you check if the NO_LABEL entry in ignored.tsv for compile.c should be removed or not?

[JelleZijlstra]

This looks good, will leave remaining decisions on prefixes up to you.