Prepare the Patatrack branch for merging into CMSSW

[fwyzard]

Track here any issues related to merging the Patatrack branch with the upstream CMSSW master branch.

[fwyzard]

Work to be integrated before the final upstream submission:

• revert forcing use of HLT conditions ? see RecoLocalTracker/SiPixelClusterizer/python/SiPixelClusterizer_cfi.py
• merge with CMSSW_10_5_0_pre1
  • merge Renumber GPU workflows #259 to fix the conflict in the runTheMatrix.py workflows
  • review and merge Next prototype of the framework integration #100 (closes Next prototype of the framework integration #119)
• review the host to device memory transfers
  • merge Use unified memory for conditions #157
  • merge Make transfer of BeamSpot asynchronous #245, superseded by Move BeamSpot transfer to GPU to its own producer #318
• review [Do not merge] Customize offline pixelTracks to the online config #160 and decide if it should be used
• restore lost changes to RiemannFit.h after the migration to 10.4.x (done by faster track fit and faster clustering #216)
• merge Add infrastructure around cub CachingDeviceAllocator, and use it in SiPixelRawToCluster #172
• review and merge faster track fit and faster clustering #216 (supersedes reduce duplicates, improve vertexing #189, Re-enable reconstruction of pixelVertices on the GPU #192 and Riemann fit patatrack #19 7, closes re-enable vertex reconstruction on the GPU #191)
• merge Fix MTV validation of initialStepPreSplitting tracks and add B-hadron MTV variation to pixel track validation sequence #199 (includes Add B-hadron MTV variation to pixel track validation sequence #193 and Fix MTV validation of initialStepPreSplitting tracks #198)
• review and merge Automatize the reuse of the CUDA stream of an input product #305
• migrate all HeterogeneousEDProducers to the new SwitchProducer approach (see Port producers to SwitchProducer  #229)
• settle on a good SoA abstraction (see Implement/Translate CPU version of the GPU-only algorithms  #221)

Do we need to include these files ?

• 27kB / 1.8k lines: EventFilter/SiPixelRawToDigi/test/RawId_moduleId.txt
• 3.7MB / 53k lines: EventFilter/SiPixelRawToDigi/test/Pixel_Phase1_Raw2Digi_GPU_Cabling_Map.dat
• 2.1MB / 6.3k lines: RecoPixelVertexing/PixelTriplets/test/pixHits.ipynb

Fix conflicts with CMSSW master branch:

• Fix conflict with Migrate tracker local reconstruction and pixel tracking to Tasks cms-sw/cmssw#25163 (done via Migrate tracker local reconstruction and pixel tracking to Tasks (backport #25163) #202)
• Synchronise with CMSSW_10_4_0_pre3
• Synchronise with CMSSW_10_4_0_pre4
• Synchronise with CMSSW_10_4_0
• Synchronise with CMSSW_10_5_0_pre1
• Synchronise with CMSSW_10_5_0_pre2
• Synchronise with CMSSW_10_5_0
• Synchronise with CMSSW_10_6_0_pre2
• Synchronise with CMSSW_10_6_0

RFC PR for master: cms-sw#25647 .

[fwyzard]

Remove obsolete files under EventFilter/SiPixelRawToDigi/test/ with #201 .

[makortel]

• what about Next prototype of the framework integration #100 and Next prototype of the framework integration #119 ?

I'd like to see #100 included and all modules migrated to it before merging to CMSSW master (after completing the steps in #100 (comment)). We can of course revisit this after all other steps have been finished if my plan takes long to execute.

[fwyzard]

I think by now all issues have either been addressed, or dropped.
Further changes can be done during the upstream review process, or after the merge.