Adds UberTrace support for pre-dispatch markers and barrier begin/end markers.
Moves shared definitions out of palgpuopen.hpp into shared header
palcapturemgr.hpp.
Change-Id: I9f464c689e7ff12c54eca043fc1ad65e1836a64f
[ROCm/clr commit: 541c449ce2]
This PR adds UberTrace-based tracing support to ROCclr's PAL device class.
Legacy RGP-based tracing is still available and is the default.
If UberTrace support is enabled tool-side, this new code path will activate.
Change-Id: I268b2dcef70e850a50e2caef8355f38bf51d4641
[ROCm/clr commit: e550032d25]