When changing graphics API to Direct3D9, OpenGLCore or OpenGLES3, shaders with SV_CullDistance won't compile and throw Error.

Steps to reproduce:
1. Open user's attached project (129886_glcore.zip)
2. Change Graphics API (in Player Settings) to Direct3D9, OpenGLCore or OpenGLES3

Result: the shader throws compiler issues and the sphere turns magenta.
Errors in the Console:
GLSL compilation failed:
ERROR: 0:23: 'vs_SV_CullDistance0' : undeclared identifier
ERROR: 0:23: 'x' : field selection requires structure, vector, or matrix on left hand side

GLSL compilation failed:
ERROR: 0:26: 'vs_SV_CullDistance0' : undeclared identifier
ERROR: 0:26: 'x' : field selection requires structure, vector, or matrix on left hand side

GLSL compilation failed:
ERROR: 0:27: 'vs_SV_CullDistance0' : undeclared identifier
ERROR: 0:27: 'x' : field selection requires structure, vector, or matrix on left hand side

GLSL compilation failed:
ERROR: 0:28: 'vs_SV_CullDistance0' : undeclared identifier
ERROR: 0:28: 'x' : field selection requires structure, vector, or matrix on left hand side

Shader error in 'Unlit/NewUnlitShader': invalid vs_3_0 output semantic 'SV_CullDistance' at line 33 (on d3d9)

Compiling Vertex program
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

Reproduced with: 2017.3.0a2, 2017.2.0b5, 2017.1.0p2, 5.6.3f1, 5.5.2p4.

Test results with different graphics APIs:
Direct3D9 - broken
Direct3D11 - works as expected
Direct3D12 (Experimental) - works when changing from Direct3D11 or OpenGLES2 , doesn't work when changing from anything else
Vulkan (Experimental) - works when changing from Direct3D11 or OpenGLES2 , doesn't work when changing from anything else
OpenGLCore - broken
OpenGLES2 - works as expected
OpenGLES3- broken