HLSL: passing gl_ClipDistance into a function call causes invalid code-gen

[Try]

Caused by type mismatch of clip-distance builtin in HLSL(float4) and GLSL(float[4]). Presumably mesh-shader only case.

Relevant part of original shader:

pos = mapViewport(pos, gl_MeshVerticesEXT[laneID].gl_ClipDistance);

spirv-cross output:

float param_3[4];
float4 _522 = mapViewport(param_2, param_3);
gl_MeshVerticesEXT[laneID].gl_ClipDistance = param_3; // cannot implicitly convert from 'float [4]' to '__restrict float4'

[Try]

gl_MeshVerticesEXT[laneID].gl_ClipDistance = param_3

This line in spirv:

%53 = OpLoad %9 %51  // param3
%55 = OpAccessChain %54 %38 %16 %20  // &gl_MeshVerticesEXT[laneID].gl_ClipDistance
OpStore %55 %53

Here OpStore, results into CompilerGLSL::cast_to_variable_store call. In theory cast_to_variable_store should already handle builtins, except it is broken and unable to recognize structure-members as builtin.

Offended part of code:

void CompilerGLSL::cast_to_variable_store(uint32_t target_id, std::string &expr, const SPIRType &expr_type)
{
        // returns gl_MeshVerticesEXT and loses information about whole access chain
	auto *var = maybe_get_backing_variable(target_id); 
	if (var)
		target_id = var->self;

	// Access chain also has no DecorationBuiltIn in this case
	if (!has_decoration(target_id, DecorationBuiltIn))
		return;