Decrease allocations in QuadTreeIndex #1858

Job	Run time
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 2s
PSV.Linux.22.04.gcc11	8m 3s
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 26s
PSV.Linux.20.04.gcc7.Cpplint	7m 49s
PSV.Commit.Checker	6s
PSV.Linux.20.04.clang	7m 45s
PSV.Linux.22.04.gcc13	12m 30s
PSV.MacOS13.Xcode15.x86_64	3m 45s
PSV.MacOS14.Xcode15	2m 46s
PSV.MacOS13.Xcode16	3m 31s
PSV.iOS.MacOS13.Xcode14	13m 40s
PSV.Win.VC2019	9m 50s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	5m 41s
PSV.Linux.Android.20.04	5m 44s
PSV.iOS.MacOS13.Xcode15	12m 57s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 16s
PSV.iOS.MacOS14.Xcode15	9m 19s
PSV.iOS.MacOS13.Xcode16	5m 4s
	2h 3m 14s

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