Added nesting LUT BELs under pb_types representing LUT Elements

Signed-off-by: Maciej Kurc <[email protected]>

Author: mkurc-ant

libs/libarchfpga/src/physical_types.h

@@ -1798,7 +1798,7 @@ struct t_arch {
 
     // Luts
     std::vector<t_lut_cell> lut_cells;
-    std::vector<t_lut_element> lut_elements;
+    std::unordered_map<std::string, std::vector<t_lut_element>> lut_elements;
 
     //The name of the switch used for the input connection block (i.e. to
     //connect routing tracks to block pins).