LArOFCCondAlg: Reduce temporary memory allocations

@christos pointed out that the LArOFCondAlg is responsible for many temporary memory allocations

This merge request affects 1 package:

• LArCalorimeter/LArRecUtils

This merge request affects 1 file:

• LArCalorimeter/LArRecUtils/src/LArOFCCondAlg.cxx

Adding @pavol as watcher

added LAr master review-pending-level-1 labels

CI Result SUCCESS (hash 4122d546)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 66268]

Approving. L1

added review-approved label and removed review-pending-level-1 label

added review-approved-tier0 label

added 21.0 review-approved-point1 labels

removed 21.0 label

(accidentally clicked on 21.0, please ignore)

merged

mentioned in commit 66eb8f54

added sweep:ignore label