Add extra header
Add extra header

Add an extra header inclusion to enable the LLVM upgrade
containing an incompatible change (https://reviews.llvm.org/D71320).

Starting from that commit, extra header "llvm/IR/IntrinsicsAMDGPU.h"
will need to be included for every file where amdgcn intrinsic is used.

After the next upgrade, when IntrinsicsAMDGPU.h is present,
I will remove AMDGPU.h inclusion and add IntrinsicsAMDGPU.h
inclusion instead.

GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc