[Backends] detect physical memory size & correct it on acpp OpenMP backend

[tdavidcl]

see : AdaptiveCpp/AdaptiveCpp#1573

On acpp OpenMP backend the global memory size report something huge (2^64 -1) so we need to correct it if we want to use this value to test allocation size.

Also remove the use of --sycl-ls and --sycl-ls-map.

[github-actions]

Workflow report

workflow report corresponding to commit dd3d579
Commiter email is timothee.davidcleris@proton.me

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Pre-commit check: ✅

trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check for merge conflicts................................................Passed
check that executables have shebangs.....................................Passed
check that scripts with shebangs are executable..........................Passed
check for added large files..............................................Passed
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check for broken symlinks............................(no files to check)Skipped
check yaml...............................................................Passed
detect private key.......................................................Passed
No-tabs checker..........................................................Passed
Tabs remover.............................................................Passed
Validate GitHub Workflows................................................Passed
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Check #pragma once.......................................................Passed
Check SYCL #include......................................................Passed

Test pipeline can run.

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No relevant changes found.
Well done!

You should now go back to your normal life and enjoy a hopefully sunny day while waiting for the review.

Doxygen diff with main

Removed warnings : 0
New warnings : 0
Warnings count : 5731 → 5731 (0.0%)

Detailed changes :