GPU/SW: Split out rasterizer, add dynamic selection

src/core/gpu_sw_rasterizer_avx2.cpp

@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: CC-BY-NC-ND-4.0
+
+#include "gpu_sw_rasterizer.h"
+
+#include "common/assert.h"
+#include "common/gsvector.h"
+
+namespace GPU_SW_Rasterizer::AVX2 {
+#define USE_VECTOR 1
+#include "gpu_sw_rasterizer.inl"
+}