8339542: compiler/codecache/CheckSegmentedCodeCache.java fails

Reviewed-by: mdoerr, shade

Author: RealLucy

test/hotspot/jtreg/compiler/codecache/CheckSegmentedCodeCache.java

@@ -179,7 +179,9 @@ public static void main(String[] args) throws Exception {
         // Fails if code heap sizes do not add up
         pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                                               "-XX:ReservedCodeCacheSize=10M",
-                                                              "-XX:NonNMethodCodeHeapSize=5M",
+                                                              // After fixing a round_down issue with large page sizes (JDK-8334564),
+                                                              // 5M is a bit too small for NonNMethodCodeHeap
+                                                              "-XX:NonNMethodCodeHeapSize=6M",
                                                               "-XX:ProfiledCodeHeapSize=5M",
                                                               "-XX:NonProfiledCodeHeapSize=5M",
                                                               "-version");