Implicit BuiltIn generate strange NonSemantic Shader Debug Info

https://godbolt.org/z/bjjz6q5so

going

#version 450
void main(){ 
    gl_Position = vec4(0);
}

I get things like

%39 = OpString "gl_PointSize"
%42 = OpString "gl_CullDistance"

%38 = OpExtInst %void %1 DebugTypeMember %39 %29 %18 %uint_1 %uint_42 %uint_0 %uint_0 %uint_3
%41 = OpExtInst %void %1 DebugTypeMember %42 %33 %18 %uint_1 %uint_85 %uint_0 %uint_0 %uint_3

and it is pointing to Line 1and Column 42 and 85 which don't exists in the source

I guess I would imagine a 2nd DebugSource is created to store all these implicit built-ins (or at least someone way to know where these are from)

Reproduce the issue using the Godbolt link and the provided GLSL source, then inspect the generated SPIR-V around the OpString and DebugTypeMember entries for implicit built-ins. Determine how their debug locations are assigned; done means the metadata no longer points to nonexistent source positions and identifies the built-in source appropriately.