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

@@ -87,11 +87,12 @@ bench-math := \
   truncf \
   y0 \
   y1 \
+  # bench-math
 
 ifneq (,$(filter yes,$(float96-fcts)))
 bench-math += \
   cbrtl \
-# bench-math
+  # bench-math
 endif
 
 ifneq (,$(filter yes,$(float128-fcts) $(float128-alias-fcts)))
@@ -100,7 +101,7 @@ bench-math += \
   ilogbf128 \
   powf128 \
   sinf128 \
-# bench-math
+  # bench-math
 endif
 
 bench-pthread := \
@@ -111,7 +112,7 @@ bench-pthread := \
   pthread-spin-trylock \
   pthread_once \
   thread_create \
-# bench-pthread
+  # bench-pthread
 
 LDLIBS-bench-pthread-mutex-lock += -lm
 LDLIBS-bench-pthread-mutex-trylock += -lm
@@ -121,7 +122,7 @@ LDLIBS-bench-pthread-spin-trylock += -lm
 bench-string := \
   ffs \
   ffsll \
-# bench-string
+  # bench-string
 
 # String function benchmarks.
 string-benchset := \
@@ -174,7 +175,7 @@ string-benchset := \
   strspn \
   strstr \
   strtok \
-# string-benchset
+  # string-benchset
 
 # Build and run locale-dependent benchmarks only if we're building natively.
 ifeq (no,$(cross-compiling))
@@ -199,7 +200,7 @@ wcsmbs-benchset := \
   wmemchr \
   wmemcmp \
   wmemset \
-# wcsmbs-benchset
+  # wcsmbs-benchset
 else
 wcsmbs-benchset :=
 endif
@@ -233,7 +234,7 @@ LOCALES := \
   tr_TR.UTF-8 \
   vi_VN.UTF-8 \
   zh_CN.UTF-8 \
-# LOCALES
+  # LOCALES
 include ../gen-locales.mk
 endif
 
@@ -241,7 +242,7 @@ hash-benchset := \
   dl-elf-hash \
   dl-new-hash \
   nss-hash \
-# hash-benchset
+  # hash-benchset
 
 stdlib-benchset := \
   arc4random \
@@ -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))
 
@@ -394,7 +411,7 @@ VALIDBENCHSETNAMES := \
   stdlib-benchset \
   string-benchset \
   wcsmbs-benchset \
-# VALIDBENCHSETNAMES
+  # VALIDBENCHSETNAMES
 
 INVALIDBENCHSETNAMES := $(filter-out ${VALIDBENCHSETNAMES},${BENCHSET})
 ifneq (${INVALIDBENCHSETNAMES},)