Disassembly view: show if there is no source

[Trass3r]

When the source code is not available for whatever reason (missing debug info, missing source file)
VS automatically shows the disassembly. Should be done here too.

Extracted from #129762 (comment)

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Disassembly view: after session ends if new session is started the disassembly view is left empty (#129526)

[weinand]

@yuehuang010 what's your opinion?

[yuehuang010]

In VS, it will show a window to ask user to load symbols, or browse for source files, or show disassembly.
IMO, disassembly is an advance view, it shouldn't be a normal users daily driver. I believe users really prefer trying to load proper symbols and sources than push them to disassembly.