[D3D12] Broken memexport shader code

src/xenia/gpu/dxbc_shader_translator.cc

@@ -1296,7 +1296,8 @@ void DxbcShaderTranslator::CompleteShaderCode() {
     // - system_temp_grad_v_.
     PopSystemTemp(6);
 
-    // TODO(Triang3l): Do memexport.
+    // Write memexported data to the shared memory UAV.
+    ExportToMemory();
 
     // Release memexport temporary registers.
     for (int i = kMaxMemExports - 1; i >= 0; --i) {

src/xenia/gpu/dxbc_shader_translator.h

@@ -830,6 +830,9 @@ class DxbcShaderTranslator : public ShaderTranslator {
   void StartPixelShader();
 
   // Writing the epilogue.
+  // ExportToMemory modifies the values of eA/eM# for simplicity, don't call
+  // multiple times.
+  void ExportToMemory();
   void CompleteVertexOrDomainShader();
   // Converts four depth values to 24-bit unorm or float, depending on the flag
   // value.