fix Issue 4372, 982 - CodeView: type of enumerator values reduced to …

[rainers]

…base type in debug info

write a forward reference to the enum definition, it is emitted elsewhere

[dlang-bot]

Thanks for your pull request, @rainers!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	982	normal	Codeview: symbols of enum type are declared integer
✓	4372	normal	type of enumerator values reduced to base type in debug info

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "master + dmd#10328"

[rainers]

This doesn't change the debug type if the enum has a complex base type (e.g. string), but that's probably better as it will be unexpected for most debuggers. mago also needed a tiny patch: rainers/mago@dd6b602

[thewilsonator]

Exception - file 'dmd\backend/code_stub.h': dmd\backend/code_stub.h: The system cannot find the file specified.
Exception - file 'dmd\backend/platform_stub.c': dmd\backend/platform_stub.c: The system cannot find the file specified.
Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748
Exception - file 'dmd\backend\backend.txt': dmd\backend\backend.txt: The system cannot find the file specified.

[thewilsonator]

Exception - file 'dmd\backend/code_stub.h': dmd\backend/code_stub.h: The system cannot find the file specified.
Exception - file 'dmd\backend/platform_stub.c': dmd\backend/platform_stub.c: The system cannot find the file specified.
Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748
Exception - file 'dmd\backend\backend.txt': dmd\backend\backend.txt: The system cannot find the file specified.

[thewilsonator]

Exception - file 'dmd\backend/code_stub.h': dmd\backend/code_stub.h: The system cannot find the file specified.
Exception - file 'dmd\backend/platform_stub.c': dmd\backend/platform_stub.c: The system cannot find the file specified.
Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748
Exception - file 'dmd\backend\backend.txt': dmd\backend\backend.txt: The system cannot find the file specified.

[thewilsonator]

Exception - file 'dmd\backend/code_stub.h': dmd\backend/code_stub.h: The system cannot find the file specified.
Exception - file 'dmd\backend/platform_stub.c': dmd\backend/platform_stub.c: The system cannot find the file specified.
Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748
Exception - file 'dmd\backend\backend.txt': dmd\backend\backend.txt: The system cannot find the file specified.

[thewilsonator]

Exception - file 'dmd\backend/code_stub.h': dmd\backend/code_stub.h: The system cannot find the file specified.
Exception - file 'dmd\backend/platform_stub.c': dmd\backend/platform_stub.c: The system cannot find the file specified.
Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748
Exception - file 'dmd\backend\backend.txt': dmd\backend\backend.txt: The system cannot find the file specified.

[rainers]

Error - file 'dmd\backend\dcgcv.d' contains trailing whitespace at line 1748

Fixed and test case added.