Replace triple call of SystemGC() to double

Signed-off-by: Florian Grabmeier <[email protected]>

Author: flooxo

test/functional/cmdLineTests/gcRegressionTests/src/com/ibm/tests/garbagecollector/TestContractionMain.java

@@ -68,11 +68,9 @@ public static void main(String[] args)
 			_array = null;
 			System.gc();
 			System.gc();
-			System.gc();
 			long tempMem = runtime.totalMemory();
 			System.gc();
 			System.gc();
-			System.gc();
 			long tempMem2 = runtime.totalMemory();
 
 			if (verbose)