Rename UnityObjectToWorldDir to TransformObjectToWorldDir + add comment

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

             // HD use specific GraphicsSettings
             GraphicsSettings.lightsUseLinearIntensity = true;
             GraphicsSettings.lightsUseColorTemperature = true;
-            // HD should always use the new batcher
+            // HD should always use the new batcher - TODO once fix are backport in 2018.2/staging
             //GraphicsSettings.useScriptableRenderPipelineBatching = true;
 
             SupportedRenderingFeatures.active = new SupportedRenderingFeatures()

ScriptableRenderPipeline/HDRenderPipeline/HDRP/ShaderVariablesFunctions.hlsl

 float3 TransformObjectToWorldNormal(float3 normalOS)
 {
 #ifdef UNITY_ASSUME_UNIFORM_SCALING
-    return UnityObjectToWorldDir(normalOS);
+    return TransformObjectToWorldDir(normalOS);
-    // mul(IT_M, norm) => mul(norm, I_M) => {dot(norm, I_M.col0), dot(norm, I_M.col1), dot(norm, I_M.col2)}
     return normalize(mul(normalOS, (float3x3)GetWorldToObjectMatrix()));
 #endif
 }

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/CoreFunctions.hlsl

 real3 TransformObjectToWorldNormal(real3 normalOS)
 {
 #ifdef UNITY_ASSUME_UNIFORM_SCALING
-    return UnityObjectToWorldDir(normalOS);
+    return TransformObjectToWorldDir(normalOS);
-    // mul(IT_M, norm) => mul(norm, I_M) => {dot(norm, I_M.col0), dot(norm, I_M.col1), dot(norm, I_M.col2)}
     return normalize(mul(normalOS, (real3x3)GetWorldToObjectMatrix()));
 #endif
 }