core/nds32: Instruct linker to use fp registers for storing gp values

This significantly decreases the code size.

BUG=b:65441143
BRANCH=none
TEST=building reef_it8320 with gcc 8.1 works

Change-Id: I4787e33a80363fa8b0f3c184167c4067ff03bffa
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1126317
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
1 file changed