8312150: Remove -Xnoagent option

Reviewed-by: dholmes, alanb

src/hotspot/share/runtime/arguments.cpp

@@ -2591,9 +2591,6 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_m
     // -Xdebug
     } else if (match_option(option, "-Xdebug")) {
       warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
-    // -Xnoagent
-    } else if (match_option(option, "-Xnoagent")) {
-      warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release.");
     } else if (match_option(option, "-Xloggc:", &tail)) {
       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);

test/hotspot/jtreg/runtime/CommandLine/TestNullTerminatedFlags.java

@@ -50,8 +50,7 @@ public class TestNullTerminatedFlags {
             "-Xshare:on",
             "-Xshare:auto",
             "-Xshare:off",
-            "-Xdebug",
-            "-Xnoagent"
+            "-Xdebug"
         };
 
     public static void main(String args[]) throws Exception{