For GLSL targets, uniform struct fields if unused will optimize out but still appear in function calls

[ArielG-NV]

For GLSL targets, uniform struct fields if unused will optimize out but still appear in function calls.

repro of issue:

//TEST(compute, vulkan):COMPARE_COMPUTE(filecheck-buffer=BUF):-vk -compute -entry computeMain

//TEST_INPUT:ubuffer(data=[0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<int> outputBuffer;

struct DefaultData
{
    static const int2 val = int2(0, 1);
    Texture2D texture;
    SamplerState samplerState1;
    SamplerState samplerState2;
    float2 size;
    float scale;
    float bias;
};

extension DefaultData
{
    int someGet()
    {
        return val.x;
    }
}

int loadDefaultData(inout DefaultData noInit)
{
    outputBuffer[1] = 1;
    return noInit.someGet();
}

[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
{
    DefaultData noInit;
    outputBuffer[0] = true
        && loadDefaultData(noInit) == 0;
        ;
    // BUF: 1
    // BUF-NEXT: 1
}

compiles into:

###
#version 450
layout(row_major) uniform;
layout(row_major) buffer;

#line 7 0
layout(std430, binding = 0) buffer StructuredBuffer_int_t_0 {
    int _data[];
} outputBuffer_0;

#line 9
struct DefaultData_0
{
    vec2 size_0;
    float scale_0;
    float bias_0;
};


#line 22
int someGet_0(DefaultData_0 this_0, texture2D this_texture_0, sampler this_samplerState1_0, sampler this_samplerState2_0)
{
    return 0;
}


#line 38
int loadDefaultData_0(inout DefaultData_0 noInit_0, texture2D noInit_texture_0, sampler noInit_samplerState1_0, sampler noInit_samplerState2_0)
{

#line 30
    outputBuffer_0._data[1U] = 1;
    return someGet_0(noInit_0, noInit_texture_0, noInit_samplerState1_0, noInit_samplerState2_0);
}


layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main()
{

#line 35
    DefaultData_0 noInit_1;

#line 35
    int _S1 = loadDefaultData_0(noInit_1, noInit_texture_1, noInit_samplerState1_1, noInit_samplerState2_1);


    outputBuffer_0._data[0U] = int(_S1 == 0);

#line 43
    return;
}

Notice as issue specifically: int _S1 = loadDefaultData_0(noInit_1, noInit_texture_1, noInit_samplerState1_1, noInit_samplerState2_1); despite the uniforms noInit_texture_1, noInit_samplerState1_1, and noInit_samplerState2_1 missing

HLSL/SPIR-V both work in this scenario through not optimizing out the variables. Slang->GLSL should not optimize out any struct members