Update derecho gnu to -O2, was missing for reasons unknown. Update

the Macros coverage flag logic.

Author: apcraig

configuration/scripts/machines/Macros.derecho_gnu

@@ -11,16 +11,19 @@ FREEFLAGS  := -ffree-form
 FFLAGS     := -fconvert=big-endian -fbacktrace -ffree-line-length-none -fallow-argument-mismatch
 FFLAGS_NOOPT:= -O0
 
+ifeq ($(ICE_COVERAGE), true)
+  FFLAGS   += -O0 -g -fprofile-arcs -ftest-coverage
+  CFLAGS   += -O0 -g -coverage
+  LDFLAGS  += -g -ftest-coverage -fprofile-arcs
+else
 ifeq ($(ICE_BLDDEBUG), true)
   FFLAGS   += -O0 -g -fcheck=bounds -finit-real=nan -fimplicit-none -ffpe-trap=invalid,zero,overflow --std f2008
 #  FFLAGS   += -O0 -g -fcheck=all -finit-real=snan -fimplicit-none -ffpe-trap=invalid,zero,overflow
   CFLAGS   += -O0
+else
+  FFLAGS   += -O2
+  CFLAGS   += -O2
 endif
-
-ifeq ($(ICE_COVERAGE), true)
-  FFLAGS   += -O0 -g -fprofile-arcs -ftest-coverage
-  CFLAGS   += -O0 -g -coverage
-  LDFLAGS  += -g -ftest-coverage -fprofile-arcs
 endif
 
 SCC   := gcc