Common: LegendrePol fix flat index (signed flip)

[f3sch]

No description provided.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1

[alibuild]

Error while checking build/O2/fullCI for f072be7 at 2025-01-28 04:01:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:


## sw/BUILD/O2-sim-challenge-test-latest/log
./sim-challenge.logDetected critical problem in logfile aod.log
./sim-challenge.logaod.log:[22329:internal-dpl-ccdb-backend]: [03:00:48][ERROR] Exception while running: Fatal error. Rethrowing.
./sim-challenge.logaod.log-[22329:internal-dpl-ccdb-backend]: [03:00:48][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-aod-producer-workflow, device shutting down. Reason: Fatal error
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][ERROR] CCDBDownloader CURL transfer error - Timeout was reached
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/CTP/Calib/OrbitReset for 1546300800000 (agent_id: alimetal02.cern.ch-1738033245-5pDPdR) with http code: 0
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][ERROR] File CTP/Calib/OrbitReset could not be retrieved. No more hosts to try.
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][FATAL] Unable to find object CTP/Calib/OrbitReset/1546300800000
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][ERROR] Exception while running: Fatal error. Rethrowing.
./sim-challenge.log[22329:internal-dpl-ccdb-backend]: [03:00:48][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-aod-producer-workflow, device shutting down. Reason: Fatal error
./sim-challenge.log[ERROR] Workflow crashed - PID 22329 (internal-dpl-ccdb-backend) did not exit correctly however it's not clear why. Exit code forced to 128.
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/37}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/38}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/40}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/42}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/43}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/45}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/46}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/47}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/48}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/49}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/37}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/38}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/40}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/42}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/43}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/45}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/46}
./digi.log[5737:internal-dpl-clock]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/47}
[0 more errors; see full log]

Full log here.

[f3sch]

Hi @shahor02, could you please merge this?