missing textual information (comments section) about WaveSize range syntax / kDxilRangedWaveSizeTag in SM6.8 shaders

Description
DXC outputs textual information about the WaveSize / kDxilWaveSizeTag in the comments section in the beginning, when present in SM6.6+ shaders. This does not happen when using the WaveSize range syntax / kDxilRangedWaveSizeTag in SM6.8+ shaders.

Steps to Reproduce

// -T cs_6_8 -E main

Buffer<float4> input : register(t0);
RWBuffer<float4> output : register(u0);

#if 0
    // output as expected
    // ; Compute Shader
    // ; NumThreads=(8,1,1)
    // ; WaveSize=32
    [WaveSize(32)]
#else
    // no output, just
    // ; Compute Shader
    // ; NumThreads=(8,1,1)
    [WaveSize(16, 32, 16)]
#endif

[numthreads(8, 1, 1)]
void main(
	in uint3 Gid : SV_GroupID,
	in uint3 DTid : SV_DispatchThreadID,
	in uint3 GTid : SV_GroupThreadID,
	in uint GIdx : SV_GroupIndex)
{
	const uint address = DTid.x;
	const float4 val = input[address];
	output[address] = val;
}

https://hlsl.godbolt.org/z/ceW89b8T9

Environment

• DXC version: tested every compiler release since SM6.8 support was integrated (v1.8.2403), including trunk
• Host Operating System: 10.0.19045.4651

Compile the supplied SM6.8 shader with the WaveSize range syntax and compare its comments with the [WaveSize(32)] case. Trace how DXC emits the opening textual comments and handles kDxilRangedWaveSizeTag, then ensure the range form is represented there and verify the output against the reproduction.