shader_recompiler: Replace buffer pulling with attribute divisor for instance step rates (#3238)

* shader_recompiler: Replace buffer pulling with attribute divisor for instance step rates

* flatten_extended_userdata: Remove special step rate buffer handling

* Review comments

* spirv_emit_context: Name all instance rate attribs properly

* spirv: Merge ReadConstBuffer again

template function only has 1 user now

* attribute: Add missing attributes

* translate: Reimplement step rate instance id

* Resolve validation warnings

* shader_recompiler: Separate vertex inputs from LS stage, cleanup tess

src/shader_recompiler/ir/passes/srt.h

@@ -20,18 +20,7 @@ struct PersistentSrtInfo {
     };
 
     PFN_SrtWalker walker_func{};
-    boost::container::small_vector<SrtSharpReservation, 2> srt_reservations;
     u32 flattened_bufsize_dw = 16; // NumUserDataRegs
-
-    // Special case for fetch shaders because we don't generate IR to read from step rate buffers,
-    // so we won't see usage with GetUserData/ReadConst.
-    // Reserve space in the flattened buffer for a sharp ahead of time
-    u32 ReserveSharp(u32 sgpr_base, u32 dword_offset, u32 num_dwords) {
-        u32 rv = flattened_bufsize_dw;
-        srt_reservations.emplace_back(sgpr_base, dword_offset, num_dwords);
-        flattened_bufsize_dw += num_dwords;
-        return rv;
-    }
 };
 
-} // namespace Shader
+} // namespace Shader