4.10 ld and NDS32

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

Disable/enable fp-as-gp relaxation.
Exporting symbols and their address into FILE as linker script.
Disable/enable link-time EX9 relaxation.
Export the EX9 table after linking.
Import the Ex9 table for EX9 relaxation.
Update the existing EX9 table.
Maximum number of entries in the ex9 table.
Avoid generating the EX9 instruction inside the loop.
Disable/enable the link-time IFC optimization.
Avoid generating the IFC instruction inside the loop.