Shuffling spirv code so it's not tied to xe::gpu.

Will make it easier to use in standalone apps.

src/xenia/gpu/shader_compiler_main.cc

@@ -0,0 +1,33 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <gflags/gflags.h>
+
+#include <string>
+#include <vector>
+
+#include "xenia/base/logging.h"
+#include "xenia/base/main.h"
+#include "xenia/base/string.h"
+#include "xenia/gpu/shader_translator.h"
+
+namespace xe {
+namespace gpu {
+
+int shader_compiler_main(const std::vector<std::wstring>& args) {
+  ShaderTranslator c;
+  return 0;
+}
+
+}  // namespace gpu
+}  // namespace xe
+
+DEFINE_ENTRY_POINT(L"xenia-gpu-shader-compiler",
+                   L"xenia-gpu-shader-compiler shader.bin",
+                   xe::gpu::shader_compiler_main);