compiler/compilercontrol/mixed/RandomCommandsTest.java test failures

# test failure with jdk-15+5-76 tier testing

compiler/compilercontrol/mixed/RandomCommandsTest.java

      Error: Agent error\: java.lang.Exception\: Agent ... timed out with a timeout of ... seconds; check console log for any additional details
      Error: Agent error: java.lang.Exception: Agent ... timed out with a timeout of ... seconds; check console log for any additional details

Extracts from attached test log -
.......
----------System.out:(8/3072)----------
For random generator using seed: -6545437138764093337
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=-6545437138764093337" to command line.
NONEXISTENT (type: OPTION): +*::*<method>*,()V (valid: false)
COMPILEONLY (type: FILE): -*::met*hod (valid: false)
INLINE (type: FILE): *,* (valid: true)
DONTINLINE (type: OPTION): *Klass*::*<method> ()V (valid: false)
.............
----------System.err:(30/1024)----------
 stdout: [CompileCommand: unrecognized command
  "nonexistent,+*::*<method>*,()V"

Usage: '-XX:CompileCommand=command,"package/Class.method()"'
Use: '-XX:CompileCommand=help' for more information.

CompileCommand: An error occurred during parsing
Line: dontinline *Klass* *<method> ()V
Error: Chars '<' and '>' only allowed in <init> and <clinit>

Usage: '-XX:CompileCommand=command,"package/Class.method()"'
Use: '-XX:CompileCommand=help' for more information.

CompileCommand: An error occurred during parsing
Line: compileonly -* met*hod
Error: Embedded * not allowed

Usage: '-XX:CompileCommand=command,"package/Class.method()"'
Use: '-XX:CompileCommand=help' for more information.

CompileCommand: inline *.*
];
............
test result: Error. Agent error: java.lang.Exception: Agent 3 timed out with a timeout of 4800 seconds; check console log for any additional details