[D3D12] Split DXBC shader translator into multiple files

src/xenia/gpu/dxbc_shader_translator.h

@@ -10,6 +10,8 @@
 #ifndef XENIA_GPU_DXBC_SHADER_TRANSLATOR_H_
 #define XENIA_GPU_DXBC_SHADER_TRANSLATOR_H_
 
+#include <gflags/gflags.h>
+
 #include <cstring>
 #include <string>
 #include <vector>
@@ -18,6 +20,8 @@
 #include "xenia/base/string_buffer.h"
 #include "xenia/gpu/shader_translator.h"
 
+DECLARE_bool(dxbc_source_map);
+
 namespace xe {
 namespace gpu {