Modifying compute buffer memory causes "unknown glslang binary operation"

I have created a simple GLSL shader to be compiled with glslang, but I get the message "Missing functionality: unknown glslang binary operation" from the logger. Are buffers not implemented?

GLSL Code
```glsl
#version 450

#extension GL_ARB_separate_shader_objects : enable

layout(binding = 0) buffer Buffer1 {
float[] fpn;
};

void main() {
uint GIX = gl_GlobalInvocationID.x;
fpn[GIX] *= 4.0f;
}
```

Start with the provided GLSL shader and reproduce the "unknown glslang binary operation" message using glslang. Trace the handling of the buffer element update and determine whether the operation is supported; done means the shader no longer triggers the missing-functionality diagnostic or the limitation is clearly documented.

Written by the indexing model from the issue text.