RFR (XS): 8020531: Test compiler/codecache/CheckUpperLimit.java fails when memory limited

[Albert Noll]

Hi all,

please review this small patch:

jbs: https://jbs.oracle.com/bugs/browse/JDK-8020531
webrev: http://cr.openjdk.java.net/~anoll/8020531/webrev.00/ 
<http://cr.openjdk.java.net/%7Eanoll/8020531/webrev.00/>

Problem:
The test assumes that a Java process can allocate 2GB of memory. 
However, this is not true for systems with limited available memory.

Solution:
Remove check that starting the VM with -XX:ReservedCodeCacheSize=2048m 
must be possible. Instead, only check that starting the VM with 
-XX:ReservedCodeCacheSize=2049m is NOT possible.

Many thanks in advance,
Albert
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