update build infrastructure for llvm-16.0.6
Update build infrastructure for LLVM 13.0.0.
Update clang build infrastructure for LLVM 11.1.0.Heavy lifting by mortimer@, thank you so much!
Update build infrastructure for LLVM 10.0.0.ok hackroom@tested by plenty
Update clang build infrastructure for LLVM 8.0.0.
Build and install a shared libLLVM, llvm-config and llvm includes.This is required to build the radeonsi Mesa driver.ok patrick@
add AMDGPUCodeGen