Finalize porting updating materials cells on accelerator

[grospelliergilles]

We need to complete the following tasks:

Top priority

• Remove remaining memory transfers between Host and Accelerator
• Keep list of memory holes in ConstituentConnectivityList when adding cells
• Keep list of memory holes in MeshMaterialVariableIndexer::endUpdateAdd()
• Do not copy on Host the list of added/removed cells in MeshMaterialModifier
• Update ItemGroup associated to a constituent using accelerator API

Priority 2

• Only update modified cells in AllEnvData::recomputeIncremental()

[DavidDureau]

@grospelliergilles , you did a good job and I agree with the optimizations you gave.

In addition, is it possible to port in arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc :

• framework/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc

  Line 63 in cbb55d5

  maxNbEnvPerCell() const

• framework/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc

  Line 83 in cbb55d5

  create(IMeshMaterialMng* mm, IMemoryAllocator* alloc)

• framework/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc

  Line 128 in cbb55d5

  bruteForceUpdate()

These methods are called when enableCellToAllEnvCellForRunCommand() is enable like in the real code and soon in Mahyco.

[grospelliergilles]

Yes I will look at that.
But when all will be finished I think the class AllCellToAllEnvCellConverter will no longer be needed.
I think now all the data are available from device.