LLVM 8 was released 20-Mar'19.
Download LLVM releases
"Dare to be naïve." - Buckminster Fuller
via The LLVM Compiler Infrastructure Project
It's still experimental for AVR though may be a go for LLVM 9 (maybe northern Fall'19)
AVR appear to be up to XMEGA and reduced core (no unified memory AVR) with 16 bugs current.
Clang has AVR ISR (interrupt, signal)
Found one instance of Clang build (Visual Studio 2017 Community, or, POSIX)
© 2018 Microchip Technology Inc.