Move the samplers from Lit.hlsl to ShaderVariables.hlsl

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

 // #define LIT_DIFFUSE_LAMBERT_BRDF
 #define LIT_USE_GGX_ENERGY_COMPENSATION
 
-// Sampler use by area light, gaussian pyramid, ambient occlusion etc...
-SamplerState s_linear_clamp_sampler;
-SamplerState s_trilinear_clamp_sampler;
-
 // Rough refraction texture
 // Color pyramid (width, height, lodcount, Unused)
 TEXTURE2D(_GaussianPyramidColorTexture);

ScriptableRenderPipeline/HDRenderPipeline/ShaderVariables.hlsl

 
 // ----------------------------------------------------------------------------
 
+// These are the samplers available in the HDRenderPipeline.
+// Avoid declaring extra samplers as they are 4x SGPR each on GCN.
+SAMPLER(s_linear_clamp_sampler);
+SAMPLER(s_linear_repeat_sampler);
+SAMPLER(s_trilinear_clamp_sampler);
+
+// ----------------------------------------------------------------------------
+
 TEXTURE2D_FLOAT(_MainDepthTexture);
 SAMPLER(sampler_MainDepthTexture);