devtools: forbid more builtin helpers for bit count

Extend checkpatches.sh to detect the use of __builtin_(ffs|ffsll).

These intrinsics are not available in MSVC, and there are perfectly
serviceable alternatives in <rte_bitops.h>.

Suggested-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>

devtools/checkpatches.sh

@@ -179,7 +179,7 @@ check_forbidden_additions() { # <patch>
 
 	# forbid use of non abstracted bit count operations
 	awk -v FOLDERS="lib drivers app examples" \
-		-v EXPRESSIONS='\\<__builtin_(clz|clzll|ctz|ctzll|popcount|popcountll)\\>' \
+		-v EXPRESSIONS='\\<__builtin_(clz|ctz|ffs|popcount)(ll)?\\>' \
 		-v RET_ON_FAIL=1 \
 		-v MESSAGE='Using __builtin helpers for bit count operations' \
 		-f $(dirname $(readlink -f $0))/check-forbidden-tokens.awk \