Vulkan: Remove "fillProgramStateMap". This copies additional shader info like uniforms from the Program to the Program Piplines. There is now a duplication between PPOs and Programs. There is no additional storage required for non-PPO Programs. Bug: angleproject:3570 Change-Id: I5ed6c946df945aaf2f65752f797b16e7649d5584 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3362297 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>