shader: respect branch reachability when refreshing scalar resources

src/graphics/shader/recompiler/ir/passes/SrtWalker.h

@@ -38,8 +38,7 @@ public:
 
 	bool Evaluate(Value value, uint32_t& result);
 	bool EvaluateDescriptor(uint32_t source, DescriptorValue& result);
-	// An empty span means that all sources are active.
-	std::span<const uint8_t> FindActiveSources();
+	// Refreshes reachable scalar reads and active descriptor sources in one walk.
 	bool RefreshFlatBuffer(std::vector<uint32_t>& flat);
 
 private: