Steps to reproduce:
1. Open user attached project
2. Open profiler and play the scene
3. Select the Memory Usage tab
4. Choose the "Detailed" mode if the memory profiler
5. Select System Memory and compare the usage results with other versions of Unity of "Particle System"

Expected result: Since 5.6.0a3, memory usage of Particle System in the editor has almost doubled. If possible, Particle System could use some optimization.

Test results:
2018.2.0a5 67.0KB
2018.1.0b11 67.0KB
2017.3.2f1 60.6KB
2017.2.2p1 59.3KB
2017.1.3p2 58.0KB
5.6.2p2 54.6KB
5.6.0b1 42.7KB
5.6.0a3 38.7KB
5.6.0a2 34.7KB
5.6.0a1 36.7KB
5.5.5p1 36.8KB
5.4.6f3 40.6KB
5.3.8p2 35.5KB

Does not occur testing on Standalone

Reproduced in: 2018.2.0a5, 2018.1.0b11, 2017.3.2f1, 2017.2.2p1, 2017.1.3p2, 5.6.2p2
Regression introduced in 5.6.0a3