benchtests: Reformat Makefile.

Reflow all long lines adding comment terminators.
Sort all reflowed text using scripts/sort-makefile-lines.py.

No regressions running microbenchmarks.
No code generation changes observed in binary artifacts.
No regressions on x86_64 and i686.

benchtests/Makefile

@@ -87,6 +87,7 @@ bench-math := \
   truncf \
   y0 \
   y1 \
+  # bench-math
 
 ifneq (,$(filter yes,$(float96-fcts)))
 bench-math += \
@@ -253,8 +254,13 @@ stdio-common-benchset := sprintf
 math-benchset := math-inlines
 
 ifeq (${BENCHSET},)
-benchset := $(string-benchset-all) $(stdlib-benchset) $(stdio-common-benchset) \
-	    $(math-benchset) $(hash-benchset)
+benchset := \
+  $(hash-benchset) \
+  $(math-benchset) \
+  $(stdio-common-benchset) \
+  $(stdlib-benchset) \
+  $(string-benchset-all) \
+  # benchset
 else
 benchset := $(foreach B,$(filter %-benchset,${BENCHSET}), ${${B}})
 endif
@@ -275,7 +281,10 @@ CFLAGS-bench-isinf.c += $(config-cflags-signaling-nans)
 CFLAGS-bench-isfinite.c += $(config-cflags-signaling-nans)
 
 ifeq (${BENCHSET},)
-bench-malloc := malloc-thread malloc-simple
+bench-malloc := \
+  malloc-simple \
+  malloc-thread \
+  # bench-malloc
 else
 bench-malloc := $(filter malloc-%,${BENCHSET})
 endif
@@ -352,7 +361,11 @@ include ../Rules
 bench-math += $(bench-libmvec)
 
 ifeq (${BENCHSET},)
-bench := $(bench-math) $(bench-pthread) $(bench-string)
+bench := \
+  $(bench-math) \
+  $(bench-pthread) \
+  $(bench-string) \
+  # bench
 else
 bench := $(foreach B,$(filter bench-%,${BENCHSET}), ${${B}})
 endif
@@ -368,8 +381,12 @@ extra-objs += $(addsuffix .o,$(addprefix bench-,$(bench-malloc)))
 
 # This makes sure CPPFLAGS-nonlib and CFLAGS-nonlib are passed
 # for all these modules.
-cpp-srcs-left := $(binaries-benchset:=.c) $(binaries-bench:=.c) \
-		 $(binaries-bench-malloc:=.c) $(timing-type:=.c)
+cpp-srcs-left := \
+  $(binaries-bench-malloc:=.c) \
+  $(binaries-bench:=.c) \
+  $(binaries-benchset:=.c) \
+  $(timing-type:=.c) \
+  # cpp-srcs-left
 lib := nonlib
 include $(patsubst %,$(..)libof-iterator.mk,$(cpp-srcs-left))