4.10 ld and NDS32

For NDS32, there are some options to select relaxation behavior. The linker relaxes objects according to these options.

--m[no-]fp-as-gp
Disable/enable fp-as-gp relaxation.
--mexport-symbols=FILE
Exporting symbols and their address into FILE as linker script.
--m[no-]ex9
Disable/enable link-time EX9 relaxation.
--mexport-ex9=FILE
Export the EX9 table after linking.
--mimport-ex9=FILE
Import the Ex9 table for EX9 relaxation.
--mupdate-ex9
Update the existing EX9 table.
--mex9-limit=NUM
Maximum number of entries in the ex9 table.
--mex9-loop-aware
Avoid generating the EX9 instruction inside the loop.
--m[no-]ifc
Disable/enable the link-time IFC optimization.
--mifc-loop-aware
Avoid generating the IFC instruction inside the loop.