Downgrade most clang tools to version 11 again
Downgrade most clang tools to version 11 again

The build jobs started failing, probably due to high memory usage.

This partially reverts commit 93011a43534105dcb09330d84cc47a7fa4b6d441.

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