Kernel debugger can't demangle more complicated symbols

[pdziepak]

A function template which takes a lambda function as an argument and is defined inside an anonymous namespace seems to be too much for the demangler that is responsible for stack traces in KDLs, as shown by the attached stack trace which was originally posted by Alex in #11246 (frames 7 and 39).

[waddlesplash]

#13720 is a duplicate but has more information.

[nielx]

Remove milestone for tickets with status = closed and resolution != fixed