8279081: ProblemList jdk/jfr/event/oldobject/TestLargeRootSet.java on 2 platforms

Reviewed-by: azvegint, sspitsyn

Author: Daniel D. Daugherty

test/jdk/ProblemList.txt

@@ -825,6 +825,7 @@ jdk/jfr/event/os/TestThreadContextSwitches.java                 8247776 windows-
 jdk/jfr/startupargs/TestStartName.java                          8214685 windows-x64
 jdk/jfr/startupargs/TestStartDuration.java                      8214685 windows-x64
 jdk/jfr/api/consumer/streaming/TestLatestEvent.java             8268297 windows-x64
+jdk/jfr/event/oldobject/TestLargeRootSet.java                   8276333 macosx-x64,windows-x64
 
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