atmel-samd: Re-enable -Os (size) optimizations.

atmel-samd/Makefile

@@ -81,43 +81,7 @@ endif
 ifeq ($(DEBUG), 1)
 CFLAGS += -O0 -ggdb
 else
-# was -Os
-CFLAGS += -O1 -ggdb -DNDEBUG
-# CFLAGS += -O0 \
-#   -ftree-ter \
-# 	-ftree-sra \
-# 	-ftree-slsr \
-# 	-ftree-sink \
-# 	-ftree-pta \
-# 	-ftree-fre \
-# 	-ftree-dse \
-# 	-ftree-dominator-opts \
-# 	-ftree-dce \
-# 	-ftree-copyrename \
-# 	-ftree-copy-prop \
-# 	-ftree-ch \
-# 	-ftree-ccp \
-# 	-ftree-bit-ccp \
-# 	-fsplit-wide-types \
-# 	-fshrink-wrap \
-# 	-fsection-anchors \
-# 	-fsched-pressure \
-# 	-fomit-frame-pointer \
-# 	-fmove-loop-invariants \
-# 	-fmerge-constants \
-# 	-fipa-reference \
-# 	-fipa-pure-const \
-# 	-fipa-profile \
-# 	-finline-functions-called-once \
-# 	-fif-conversion \
-# 	-fif-conversion2 \
-# 	-fguess-branch-probability \
-# 	-fforward-propagate \
-# 	-fdefer-pop \
-# 	-fcprop-registers \
-# 	-fcompare-elim \
-# 	-fcombine-stack-adjustments \
-# 	-fbranch-count-reg
+CFLAGS += -Os -DNDEBUG
 endif
 
 LIBS =