torture: Put kvm.sh batch-creation awk script into a temp file

This commit is a first step towards pinning guest-OS vCPUs so as
to force latency differences, especially on multi-socket systems.
The kvm.sh script puts its batch-creation awk script into a temporary
file so that later commits can add the awk code needed to dole out CPUs
so as to maximize latency differences.  This awk code will be used by
multiple scripts.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/bin/kvm.sh

@@ -430,17 +430,8 @@ then
 	git diff HEAD >> $resdir/$ds/testid.txt
 fi
 ___EOF___
-awk < $T/cfgcpu.pack \
-	-v TORTURE_BUILDONLY="$TORTURE_BUILDONLY" \
-	-v CONFIGDIR="$CONFIGFRAG/" \
-	-v KVM="$KVM" \
-	-v ncpus=$cpus \
-	-v jitter="$jitter" \
-	-v rd=$resdir/$ds/ \
-	-v dur=$dur \
-	-v TORTURE_QEMU_ARG="$TORTURE_QEMU_ARG" \
-	-v TORTURE_BOOTARGS="$TORTURE_BOOTARGS" \
-'BEGIN {
+cat << '___EOF___' > $T/dumpbatches.awk
+BEGIN {
 	i = 0;
 }
 
@@ -560,7 +551,19 @@ END {
 	# Dump the last batch.
 	if (ncpus != 0)
 		dump(first, i, batchnum);
-}' >> $T/script
+}
+___EOF___
+awk < $T/cfgcpu.pack \
+	-v TORTURE_BUILDONLY="$TORTURE_BUILDONLY" \
+	-v CONFIGDIR="$CONFIGFRAG/" \
+	-v KVM="$KVM" \
+	-v ncpus=$cpus \
+	-v jitter="$jitter" \
+	-v rd=$resdir/$ds/ \
+	-v dur=$dur \
+	-v TORTURE_QEMU_ARG="$TORTURE_QEMU_ARG" \
+	-v TORTURE_BOOTARGS="$TORTURE_BOOTARGS" \
+	-f $T/dumpbatches.awk >> $T/script
 echo kvm-end-run-stats.sh "$resdir/$ds" "$starttime" >> $T/script
 
 # Extract the tests and their batches from the script.