Fixed memory lea issue in stage 4

Added Stage 5 polygon and array functions

stage4/bootasm2.S

@@ -275,14 +275,14 @@ cons_filled_rect_check_x_dir:
     cmpw    $0, %ax
     jge     cons_filled_rect_check_y_dir
     add     %ax, rectx(%bp)
-    neg     rectwidth(%bp)
+    negw    rectwidth(%bp)
 
 cons_filled_rect_check_y_dir:
     movw    rectheight(%bp), %ax            # Check if the user has entered a negative height value and swap the direction to a pos
     cmpw    $0, %ax
     jge     cons_filled_rect_check_x_zero
     add     %ax, recty(%bp)
-    neg     rectheight(%bp)    
+    negw    rectheight(%bp)    
 
 cons_filled_rect_check_x_zero:
     movw    rectx(%bp), %ax                 # Check if the x value is a negative value, set it to 0 and figure out the offset so we
@@ -344,8 +344,7 @@ cons_filled_rect_setup:
     movw    (screen_width), %ax          # Set ax to 320 so that we can multiply this by y   
     mul     %dx                          # does the (y * 320) part of our math            
     add     rectx(%bp), %ax              # Add the value of x to register ax
-    movw    %ax, %si
-    lea     %es:(%si), %bx      # Load the memory address into the bx register
+    movw    %ax, %bx                     # Load the memory offset address into the bx register    
     
     movw    rectheight(%bp), %si    # Set the counter to our height which should be the number of lines to draw to