[gl] Delete location shift WAR

bug: 143919384

Test: No regressions in dEQP-EG,GLES2, GLES3. Chrome shadertoy works.

Perf increase: Remove ~40% of cycles from glUniform* calls.
webgl aquarium, 20k fishes: 26-27 fps -> 27-29 fps (z840, quadro k2200)

Change-Id: Ib126ff0a31645fb20a40436c1d5a653ee5cf2563
3 files changed