8338428: Add logging of final VM flags while setting properties

Reviewed-by: rschmelter
Backport-of: 48277018a5a3fe861ebe9bf0860a2809611fb66f

Author: GoeLin

test/hotspot/jtreg/TEST.ROOT

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2005, 2023, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2005, 2025, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -46,7 +46,10 @@ requires.extraPropDefns.bootlibs = ../../lib/jdk/test/whitebox
 requires.extraPropDefns.libs = \
     ../../lib/jdk/test/lib/Platform.java \
     ../../lib/jdk/test/lib/Container.java
-requires.extraPropDefns.vmOpts = -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
+requires.extraPropDefns.vmOpts = -XX:+UnlockDiagnosticVMOptions \
+    -XX:+LogVMOutput -XX:-DisplayVMOutput -XX:LogFile=vmprops.flags.final.vm.log \
+    -XX:+PrintFlagsFinal \
+    -XX:+WhiteBoxAPI
 requires.properties= \
     sun.arch.data.model \
     vm.simpleArch \

test/jdk/TEST.ROOT

@@ -1,6 +1,10 @@
+#
+# Copyright (c) 2005, 2025, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
 # This file identifies the root of the test-suite hierarchy.
 # It also contains test-suite configuration information.
-
+#
 # The list of keywords supported in the entire test suite.  The
 # "intermittent" keyword marks tests known to fail intermittently.
 # The "randomness" keyword marks tests using randomness with test
@@ -72,7 +76,10 @@ requires.extraPropDefns.bootlibs = ../lib/jdk/test/whitebox
 requires.extraPropDefns.libs = \
     ../lib/jdk/test/lib/Platform.java \
     ../lib/jdk/test/lib/Container.java
-requires.extraPropDefns.vmOpts = -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
+requires.extraPropDefns.vmOpts = -XX:+UnlockDiagnosticVMOptions \
+    -XX:+LogVMOutput -XX:-DisplayVMOutput -XX:LogFile=vmprops.flags.final.vm.log \
+    -XX:+PrintFlagsFinal \
+    -XX:+WhiteBoxAPI
 requires.properties= \
     sun.arch.data.model \
     java.runtime.name \