Malloc Memory Pool increases periodically when running scenes with SpriteShapes on Android device

Repro steps:
* Open attached project, open PerfTest_Many scene and Build and Run it on an Android device (Mono Scripting backend)
* In the Profiler observe total used memory increase over time
In the Memory Profiler compare snapshots at the start of app run and 15 mins later, observe 1GB increase in Native Memory, Malloc(Temp) Pool

Expected result: Memory should not increase over time
Actual result: Memory increases over time

Tested on:
Samsung galaxy S8 Plus
Motorola Nexus 6