8323183: ClassFile API performance improvements

src/java.base/share/classes/jdk/internal/classfile/impl/StackMapDecoder.java

@@ -80,7 +80,8 @@ public static List<VerificationTypeInfo> initFrameLocals(ClassEntry thisClass, S
         } else {
             vtis = new VerificationTypeInfo[methodType.parameterCount()];
         }
-        for(var arg : methodType.parameterList()) {
+        for(int pi = 0; pi < methodType.parameterCount(); pi++) {
+            var arg = methodType.parameterType(pi);
             vtis[i++] = switch (arg.descriptorString().charAt(0)) {
                 case 'I', 'S', 'C' ,'B', 'Z' -> SimpleVerificationTypeInfo.ITEM_INTEGER;
                 case 'J' -> SimpleVerificationTypeInfo.ITEM_LONG;