Undo `PipelineBuilder` changes from #1604
Undo `PipelineBuilder` changes from #1604

Restore the ability to get pipeline dumps even when compilation fails.
Fix suggested in
https://github.com/GPUOpen-Drivers/llpc/pull/1604#discussion_r778193687.

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