Decrease allocations in QuadTreeIndex #1859

Job	Run time
PSV.Linux.20.04.gcc7.Cpplint	7m 39s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 33s
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 25s
PSV.Linux.22.04.gcc13	12m 13s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	5m 53s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 4s
PSV.MacOS14.Xcode15	3m 1s
PSV.Linux.22.04.gcc11	8m 19s
PSV.Linux.20.04.clang	7m 36s
PSV.MacOS13.Xcode15.x86_64	5m 20s
PSV.Linux.Android.20.04	6m 3s
PSV.iOS.MacOS13.Xcode14	11m 7s
PSV.MacOS13.Xcode16	3m 39s
PSV.iOS.MacOS13.Xcode15	12m 13s
PSV.iOS.MacOS14.Xcode15	16m 26s
PSV.Commit.Checker	6s
PSV.iOS.MacOS13.Xcode16	5m 52s
PSV.Win.VC2019	9m 2s
	2h 9m 31s

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