Reproduction steps:
1. Open "XR_ShaderGraph.zip" project with updated SRP master
2. Enter Play mode

Expected Result: ShaderGraph Materials work on both eyes properly
Actual Result: ShaderGraph Materials are pink in one eye and missing in the other eye

Reproduced with: 2020.1.0a12, 2019.3.0b10, 2019.2.12f1, 2018.4.12f1
Did not reproduce on: 2017.4.34f1

Errors:
"Shader error in 'Shader Graphs/PBR': undeclared identifier 'unity_StereoEyeIndex' at /repo/ScriptableRenderPipeline/com.unity.render-pipelines.core/ShaderLibrary/UnityInstancing.hlsl(161) (on d3d11)
Compiling Vertex program with STEREO_INSTANCING_ON _MAIN_LIGHT_SHADOWS _ADDITIONAL_LIGHTS_VERTEX
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_LIGHTMAP_FULL_HDR

Shader error in 'Shader Graphs/Unlit': invalid subscript 'stereoTargetEyeIndex' at /repo/ScriptableRenderPipeline/com.unity.render-pipelines.universal/Editor/ShaderGraph/Includes/UnlitPass.hlsl(13) (on d3d11)
Compiling Vertex program with STEREO_INSTANCING_ON
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_LIGHTMAP_FULL_HDR"