[HLSL] Uniform variable in entry point params gets compiled to input variable

[rdb]

Running this command:

glslangValidator -e main -H test.vert.hlsl

On this shader:

void main(uniform float4 somevar,
          out float4 l_position : SV_Position) {

  l_position = somevar;
}

Results in somevar being compiled as Input instead of being added either as UniformConstant or being added to the $Global block:

...
              16:             TypePointer Input 7(fvec4)
     17(somevar):     16(ptr) Variable Input
...

This is a major blocker for us.