To reproduce:
1. Open attached Unity project "MSAA Bloom.zip"
2. Open "TEST" scene
3. Look around the scene with right mouse button and observe the "edge" of the sphere

Expected result: The sphere should not emit any flickering
Actual result: There is a minimal visible white pixel flickering at the "edge" of the sphere
Note: flickering is present in both Play and Editor modes.

Reproduced on: 5.6.0f1, 5.6.0p3, 5.6.0p4, 5.6.1f1, 5.6.1p1, 2017.1.0b5
Note: Can't reproduce on 5.5 and older versions since it was not possible to have both HDR and Anti Aliasing enabled at the same time.

Note: attached gif "flicker1" shows the flickering in all 2017 versions and 5.6 versions from 5.6.0f1 to 5.6.0p3
Note: attached gif "Flickernew" shows the flickering from 5.6.0p4 to 5.6.1p1