[COMPILER REQUEST]: Enable ClangIR on C language not only C++

Compiler name

LLVM ClangIR

Compiler version

trunk

Compiler language

C

Compiler homepage

https://clang.llvm.org/docs/CIR/index.html

Motivation

ClangIR is added to C++ language and built daily, but it is not enabled when selecting C language. It would be very helpful to enable it for C too