8334886: jdk/jfr/api/recording/time/TestTimeMultiple.java failed with RuntimeException: getStopTime() > afterStop

Reviewed-by: mgronlun

Author: egahlin

src/hotspot/share/jfr/recorder/repository/jfrChunk.cpp

@@ -47,8 +47,6 @@ jlong JfrChunk::nanos_now() {
   const jlong now = seconds * 1000000000 + nanos;
   if (now > last) {
     last = now;
-  } else {
-    ++last;
   }
   return last;
 }

src/jdk.jfr/share/classes/jdk/jfr/internal/JVMSupport.java

@@ -103,7 +103,6 @@ static long nanosToTicks(long nanos) {
 
     static long getChunkStartNanos() {
         long nanos = JVM.getChunkStartNanos();
-        // JVM::getChunkStartNanos() may return a bumped timestamp, +1 ns or +2 ns.
         // Spin here to give Instant.now() a chance to catch up.
         awaitUniqueTimestamp();
         return nanos;