Rewriter remove used static global variable which is used for other static global variable definition used by entryPoint

dxr test.hlsl -E VSMain -remove-unused-globals

static const float POINT_SIZE = 3.0f;
static const float3 POINT_SIZE_3 = float3(1.0f, 1.0f, 1.0f) * POINT_SIZE;

struct PSInput
{
    float4 position : POSITION;
};

PSInput VSMain(float3 position : POSITION)
{
    PSInput psInput;
    psInput.position = float4(position, 1.0f);
    psInput.position.xyz *= POINT_SIZE_3;
    return psInput;
}

In the above test case, EntryPoint is using POINT_SIZE_3 and thus it is not optimized out by rewriter. That POINT_SIZE_3 need POINT_SIZE for variable definition, but rewriter remove POINT_SIZE. It leads to compile error

Start by reproducing the issue with the shown test.hlsl and dxr test.hlsl -E VSMain -remove-unused-globals, then trace the rewriter's unused-global handling. Done means POINT_SIZE is retained when POINT_SIZE_3 is used by VSMain, and the rewritten shader compiles successfully.