SL-18190 Use bindDeferredShader in alpha pool. Don't redundantly apply ao to irradiance.

indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl

@@ -157,7 +157,8 @@ void main()
         vec3  irradiance = vec3(0);
         vec3  radiance  = vec3(0);
         sampleReflectionProbes(irradiance, radiance, pos.xyz, norm.xyz, gloss);
-        irradiance       = max(amblit*1.725,irradiance*ambocc);
+        
+        irradiance       = max(amblit*1.725,irradiance);
 
         vec3 f0 = vec3(0.04);
         vec3 baseColor = diffuse.rgb;

indra/newview/lldrawpoolalpha.cpp

@@ -751,7 +751,7 @@ void LLDrawPoolAlpha::renderAlpha(U32 mask, bool depth_only, bool rigged)
                     if (current_shader != target_shader)
                     {// If we need shaders, and we're not ALREADY using the proper shader, then bind it
                     // (this way we won't rebind shaders unnecessarily).
-                        target_shader->bind();
+                        gPipeline.bindDeferredShader(*target_shader);
                     }
 
                     LLVector4 spec_color(1, 1, 1, 1);