"In particular, because I expect Microsoft to reuse the existing compiler, I hope that a side effect of this will be better PDB [Program Database] support,"
Yep, working on it:
* https://reviews.llvm.org/D148761
* https://reviews.llvm.org/D149367/new/
Disclaimer: I am a Microsoft employee, and those are my PRs...
Biting the hand that feeds IT
