Internal Compiler error (argument of incompatible type) when using Buffer as a buffer name

Description
Following simple compute shader fails to compile:

RWByteAddressBuffer Buffer : register(u0);
[numthreads(1, 1, 1)]
void mainCS(uint3 dtid: SV_DispatchThreadID) {
    uint value = Buffer.Load(123);
}

Steps to Reproduce
Compile the shader with command line:

dxc.exe -T cs_6_0 -E mainCS -Fo MyCS.dxil MyCS.hlsl

Actual Behavior

Internal Compiler error: llvm::cast<X>() argument of incompatible type!

Changing the name of the buffer to something else like Buffer solves the problem.

I understand that I shouldn't use word Buffer for the name of my buffer, but I suggest outputting some more descriptive error message, communicating more directly what is wrong about the shader code.

Environment

• DXC version: dxcompiler.dll: 1.8 - 1.8.2502.11 (239921522); dxil.dll: 1.8(1.8.2502.11), as bundled in Windows SDK 10.0.26100.0.
• Host Operating System: Windows 11 x86-64 25H2 (OS Build 26200.7171)

Start by reproducing the shader with dxc.exe using the command and DXC version given, then trace how the identifier Buffer is handled during compilation. Done means the shader no longer produces an LLVM cast internal compiler error and instead reports a descriptive diagnostic about the invalid name.