[SPIR-V] Decorations on `vk::BufferPointer` aren't applied with no error or warning

[devshgraphicsprogramming]

Description

Context: Trying to apply Coherent decoration on PhysicalStorageBuffer address space pointer, because due to lack of Vulkan memory model #7180 we can't use MakeAvailable/MakeVisible on individual load/store and atomics.

Steps to Reproduce

Put a decoration on a vk::BufferPointer variable https://godbolt.org/z/4qW5zKPzc

Actual Behavior

There's no error or warning, OpDecorate not present in emitted SPIR-V

Environment

• DXC version
• Host Operating System

[devshgraphicsprogramming]

Actually even decorations on Inline Spir-V typed members don't stick either

struct PSInput
{
    float4 position : SV_Position;
    float4 color    : COLOR0;
};

#include "nbl/builtin/hlsl/bda/__ref.hlsl"

using namespace nbl::hlsl;

struct Wrapper
{
    [[vk::ext_decorate(5356)]] spirv::bda_pointer_t<uint32_t> p;
};

float4 PSMain(PSInput input) : SV_Target0
{
    Wrapper w;
    w.p = spirv::bitcast<spirv::bda_pointer_t<uint32_t> >(0x0ull);
    spirv::store<uint32_t,4>(w.p,45);
    return input.color * input.color;
}

without any warning or error either