[llvm] [MSVC][Demangling] Make Microsoft demangling more configurable (PR #202702)

[Fred Tingaud via llvm-commits]

frederic-tingaud-sonarsource wrote:

@AaronBallman, @zmodem, pinging you, since you both reviewed PRs in this area "recently". 

https://github.com/llvm/llvm-project/pull/202702