hg: code-tools/jcstress: Make StringBu* tests more resilient.

[aleksey.shipilev at oracle.com]

Changeset: bda9fbee58c8
Author:    shade
Date:      2015-10-21 20:35 +0300
URL:       http://hg.openjdk.java.net/code-tools/jcstress/rev/bda9fbee58c8

Make StringBu* tests more resilient.

+ jcstress-core/src/main/java/org/openjdk/jcstress/infra/results/StringResult1.java
! tests-custom/src/main/java/org/openjdk/jcstress/tests/strings/StringBufferTest.java
! tests-custom/src/main/java/org/openjdk/jcstress/tests/strings/StringBuilderTest.java