remove CodeView check on pdb create

[trivalik]

try to fix #2973

Problem

No CodeView blocks pdb generation.

Solution

Generate a guid with zeroed timestamp in case no CodeView exists.

[christophwille]

Can you provide evidence (eg some docs) why that is a proper fix?

[trivalik]

No, but generation works.

[siegfriedpammer]

"generation works", yes, but debuggers might reject the PDB because it does not match the timestamp/hash stored in the DLL. Some debuggers will refuse to load any PDB at all, if the DebugView entry is missing.

Someone from the Visual Studio Debugger team even contributed a way for the Visual Studio Debugger to pass an ID to the PDB Generator that is used/accepted by the VS Debugger: #2678... there are a couple of pointers in the PR description.

[trivalik]

I see, after further testing. If you build a project without a pdb. Then it is impossible to use the created pdb in Visual Studio. Maybe a improve of the error text would make sense then, that builded programs without debug information the use of a generated is not possible. Only ILSpy itself could load the pdb right now, but makes not really sense, as long as obfuscated names could not be overridden via pdb.

[christophwille]

I am closing this because aside from generating a pdb, it doesn't create a working pdb.