shader_recompiler: add SSA

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

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "graphics/shader/recompiler/ir/Block.h"
+
+namespace Libs::Graphics::ShaderRecompiler::IR {
+
+void ConstantPropagationPass(const BlockList& blocks);
+
+} // namespace Libs::Graphics::ShaderRecompiler::IR