helpers: Improve D3D8/9 shader size computation once again.

Based on [email protected]'s comment.

helpers/d3dcommonsize.hpp

@@ -134,35 +134,28 @@ _shaderSize(const DWORD *pFunction)
             if (dwToken & 0x80000000U) {
                 continue;
             }
-
-            // FIXME: 
-            // Code that should advance over comment tokens and raw data tokens for sm 1_x is not fail safe
-            // keeping chances of false D3DSIO_END is better then crashing
-
-            /*            
+
             D3DSHADER_INSTRUCTION_OPCODE_TYPE opcode = D3DSHADER_INSTRUCTION_OPCODE_TYPE(dwToken & D3DSI_OPCODE_MASK);
-            
             switch (opcode) {
             case D3DSIO_COMMENT:
                 dwLength += (dwToken & D3DSI_COMMENTSIZE_MASK) >> D3DSI_COMMENTSIZE_SHIFT;
                 break;
-            
-            //this opcodes contain raw data, so they can't be processed with bit 31 test
-            case D3DSIO_DEFB:
-                dwLength += 2;
-                break;
-            case D3DSIO_DEFI:
+
             case D3DSIO_DEF:
+                // Contains raw floating point so can't be advanced with the 31 bit test.
+                // NOTE: DEFB/DEFI are SM 2 only.
                 dwLength += 5;
                 break;
-            default:               
+
+            case D3DSIO_END:
+                // https://docs.microsoft.com/en-us/windows-hardware/drivers/display/end-token
+                if (dwToken == D3DSIO_END) {
+                    return dwLength * sizeof *pFunction;
+                }
+                break;
+
+            default:
                 break;
-            }								
-            */
-
-            // https://docs.microsoft.com/en-us/windows-hardware/drivers/display/end-token
-            if (dwToken == D3DSIO_END) {
-                return dwLength * sizeof *pFunction;
             }
         }
     }