Lots of GLSL warnings on cold start

[ada-tv]

[04/22 03:19:18] [WARNING] [hifi.gl] GLShader::compileShader - Success:
[04/22 03:19:18] [WARNING] [hifi.gl] 0:309(678): warning: `_5289' used uninitialized
[04/22 03:19:18] [WARNING] [hifi.gl] 0:309(737): warning: `_5289' used uninitialized

It seems like Interface sometimes locks up part way through this as well, ending the log with the line

[04/22 03:19:22] [WARNING] [hifi.gl] 

[JulianGro]

The warnings during shader compilation are pretty normal. Well, at least they are not new.

I haven't had Interface lock up during that though, so that would be new.

[HifiExperiments]

this (the warnings, not the lock up, which I’ve never seen) might be fixed as part of #1531, at least I don’t think I’ve seen them for a bit since working on that