Relocate truncation

https://www.altera.com/support/support-resources/knowledge-base/solutions/rd09302013_702.html

https://sourceware.org/binutils/docs-2.25/ld/Nios-II.html

http://sourceware-org.1504.n7.nabble.com/PATCH-committed-Nios-II-CALL26-linker-relaxation-td259194.html

NIOS tutorials come out:
https://www.google.co.in/search?q=ベクタテーブル+NIOS