esp8266/boards: Move py/pairheap.c code from iRAM to iROM.
It doesn't need to be in iRAM.
@@ -109,6 +109,7 @@ SECTIONS
*py/nlr*.o*(.literal* .text*)
*py/obj*.o*(.literal* .text*)
*py/opmethods.o*(.literal* .text*)
+ *py/pairheap*.o*(.literal* .text*)
*py/parse*.o*(.literal* .text*)
*py/profile*.o*(.literal* .text*)
*py/qstr.o*(.literal* .text*)
