shader: Add pools and rename files

src/shader_recompiler/backend/spirv/emit_spirv.h

@@ -0,0 +1,21 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "shader_recompiler/frontend/ir/microinstruction.h"
+#include "shader_recompiler/frontend/ir/program.h"
+
+namespace Shader::Backend::SPIRV {
+
+class EmitSPIRV {
+public:
+private:
+    // Microinstruction emitters
+#define OPCODE(name, result_type, ...) void Emit##name(EmitContext& ctx, IR::Inst* inst);
+#include "shader_recompiler/frontend/ir/opcodes.inc"
+#undef OPCODE
+};
+
+} // namespace Shader::Backend::SPIRV