Finalize porting updating materials cells on accelerator

[grospelliergilles]

We need to complete the following tasks:

Top priority

• [x] 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()
• [x] Do not copy on Host the list of added/removed cells in MeshMaterialModifier
• [x] 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 :

• https://github.com/arcaneframework/framework/blob/cbb55d539f7ce47ddb0a9f2215ebf7b885f0169f/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc#L63
• https://github.com/arcaneframework/framework/blob/cbb55d539f7ce47ddb0a9f2215ebf7b885f0169f/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc#L83
• https://github.com/arcaneframework/framework/blob/cbb55d539f7ce47ddb0a9f2215ebf7b885f0169f/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc#L128

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.