RFR(XS): 8193597: sun/nio/cs/TestStringCoding.java fails intermittently with getBytes(csn) failed -> GBK

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8193597/webrev.00/

In the test case, the loop limit check is replicated out of the loop and
the cmp node is shared by the two checks. When loop strip mining adjust
the inner loop's limit check it also changes the outer of loop
check. The fix is to change the cloned loop limit check so the outer of
loop test is not affected.

Roland.