Cleanup: EEVEE: Rename variable named sample because ...

.. it's a reserved keyword on GL > 4.0.

source/blender/draw/engines/eevee/shaders/effect_bloom_frag.glsl

@@ -177,11 +177,11 @@ vec4 step_blit(void)
 vec4 step_downsample(void)
 {
 #ifdef HIGH_QUALITY /* Anti flicker */
-  vec3 sample = downsample_filter_high(sourceBuffer, uvcoordsvar.xy, sourceBufferTexelSize);
+  vec3 samp = downsample_filter_high(sourceBuffer, uvcoordsvar.xy, sourceBufferTexelSize);
 #else
-  vec3 sample = downsample_filter(sourceBuffer, uvcoordsvar.xy, sourceBufferTexelSize);
+  vec3 samp = downsample_filter(sourceBuffer, uvcoordsvar.xy, sourceBufferTexelSize);
 #endif
-  return vec4(sample, 1.0);
+  return vec4(samp, 1.0);
 }
 
 vec4 step_upsample(void)

source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl

@@ -108,8 +108,8 @@ void main()
 
         weight = texel_solid_angle(facecoord, halfpix);
 
-        vec4 sample = textureLod(probeHdr, cubevec, lodMax);
-        sh += sample.rgb * coef * weight;
+        vec4 samp = textureLod(probeHdr, cubevec, lodMax);
+        sh += samp.rgb * coef * weight;
         weight_accum += weight;
       }
     }

source/blender/draw/engines/eevee/shaders/lightprobe_filter_visibility_frag.glsl

@@ -80,9 +80,9 @@ void main()
   vec2 accum = vec2(0.0);
 
   for (float i = 0; i < sampleCount; i++) {
-    vec3 sample = sample_cone(i, invSampleCount, M_PI_2 * visibilityBlur, cos, T, B);
-    float depth = texture(probeDepth, sample).r;
-    depth = get_world_distance(depth, sample);
+    vec3 samp = sample_cone(i, invSampleCount, M_PI_2 * visibilityBlur, cos, T, B);
+    float depth = texture(probeDepth, samp).r;
+    depth = get_world_distance(depth, samp);
     accum += vec2(depth, depth * depth);
   }
 

source/blender/draw/engines/eevee/shaders/lightprobe_lib.glsl

@@ -209,9 +209,9 @@ vec3 probe_evaluate_planar(int id, PlanarData pd, vec3 P, vec3 N, vec3 V, float
   /* TODO: If we support non-ssr planar reflection, we should blur them with gaussian
    * and chose the right mip depending on the cone footprint after projection */
   /* NOTE: X is inverted here to compensate inverted drawing.  */
-  vec3 sample = textureLod(probePlanars, vec3(refco.xy * vec2(-0.5, 0.5) + 0.5, id), 0.0).rgb;
+  vec3 radiance = textureLod(probePlanars, vec3(refco.xy * vec2(-0.5, 0.5) + 0.5, id), 0.0).rgb;
 
-  return sample;
+  return radiance;
 }
 
 void fallback_cubemap(vec3 N,