Retain compatibility with LLVM 6, 7, 8 and 9
Retain compatibility with LLVM 6, 7, 8 and 9

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust