8308910: Allow executeAndLog to accept running process

Reviewed-by: lucy
Backport-of: 024d9b131d6c2d5ee6c8cafdb05b9e9e299d588e

Author: GoeLin

test/lib/jdk/test/lib/cds/CDSTestUtils.java

@@ -594,8 +594,12 @@ public static File getSourceFile(String name) {
 
     // ============================= Logging
     public static OutputAnalyzer executeAndLog(ProcessBuilder pb, String logName) throws Exception {
+        return executeAndLog(pb.start(), logName);
+    }
+
+    public static OutputAnalyzer executeAndLog(Process process, String logName) throws Exception {
         long started = System.currentTimeMillis();
-        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        OutputAnalyzer output = new OutputAnalyzer(process);
         String logFileNameStem =
             String.format("%04d", getNextLogCounter()) + "-" + logName;