[TESTBUG] test/compiler/8002069/Test8002069.java might throw OutOfMemoryError when additional Java code is running

With a Java heap size of 32MB memory pressure when running with Graal might become too big and an OutOfMemoryError gets thrown:

cthaling@macbook:~/ws/graal/test/compiler/8002069$ $PRODUCT_HOME/bin/java -Xmx32m -XX:+IgnoreUnrecognizedVMOptions -Xbatch -XX:CompileCommand=exclude,Test8002069.dummy Test8002069
CompilerOracle: exclude Test8002069.dummy
Bootstrapping Graal.........................java.lang.OutOfMemoryError: GC overhead limit exceeded