Upgrade asm to version 7.4

Fixes: b/261594101
Change-Id: Id46cf651c9cc9c445e8d3c418ac16ef43822c90c
diff --git a/build.gradle b/build.gradle
index bde2f60..49d3ecf 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,7 +33,7 @@
 
 ext {
     androidSupportVersion = '25.4.0'
-    asmVersion = '9.3'  // When updating update tools/asmifier.py, build.src and Toolhelper as well.
+    asmVersion = '9.4'  // When updating update tools/asmifier.py, build.src and Toolhelper as well.
     espressoVersion = '3.0.0'
     fastutilVersion = '7.2.0'
     guavaVersion = '30.1.1-jre'