Add option for before-after or just ref-drivers

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

docs/architecture/psa-migration/outcome-analysis.sh

@@ -48,6 +48,8 @@ IGNORE="md mdx shax" # accelerated
 IGNORE="$IGNORE entropy hmac_drbg random" # disabled (ext. RNG)
 IGNORE="$IGNORE psa_crypto_init" # needs internal RNG
 IGNORE="$IGNORE hkdf" # disabled
+# Compare only "reference vs driver" or also "before vs after"?
+BEFORE_AFTER=1 # 0 or 1
 # ----- END edit this -----
 
 set -eu
@@ -63,6 +65,7 @@ record() {
     make check
 }
 
+if [ "$BEFORE_AFTER" -eq 1 ]; then
     # save current HEAD
     HEAD=$(git branch --show-current)
 
@@ -83,6 +86,7 @@ record "after-default"
     cleanup
     scripts/config.py full
     record "after-full"
+fi
 
 # get the numbers now for driver-only and reference
 cleanup
@@ -147,6 +151,8 @@ compare_builds () {
 }
 
 populate_suites
+if [ "$BEFORE_AFTER" -eq 1 ]; then
     compare_builds before-default after-default
     compare_builds before-full after-full
+fi
 compare_builds reference drivers