Fix diff_asm.go.

We now have another non-OpenSSL perlasm file.

Change-Id: Id5ab606089f22a4cb4c7d29f2cf7d140b66861f7
Reviewed-on: https://boringssl-review.googlesource.com/14404
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Steven Valdez <svaldez@chromium.org>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/util/diff_asm.go b/util/diff_asm.go
index 0a0888b..bc9363f 100644
--- a/util/diff_asm.go
+++ b/util/diff_asm.go
@@ -31,7 +31,7 @@
 
 func mapName(path string) string {
 	switch filepath.ToSlash(path) {
-	case "crypto/rand/asm/rdrand-x86_64.pl":
+	case "crypto/cipher/asm/chacha20_poly1305_x86_64.pl", "crypto/rand/asm/rdrand-x86_64.pl":
 		return ""
 	case "crypto/ec/asm/p256-x86_64-asm.pl":
 		return filepath.FromSlash("crypto/ec/asm/ecp_nistz256-x86_64.pl")