UTF16 string gets constructed incorrectly from codepoints if CompactStrings is not enabled

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        After the changes for JDK-8311906, an attempt to compile the following pattern: "ab(\\P{all})+" fails with: java.util.regex.PatternSyntaxException: Unknown character property name {} near index 9 if compact strings is not enabled.
        As a result, javac won't work on a platform where compact strings are not enabled by default.
        However, the problem itself is platform-independent, and can be reproduced on all platforms with -XX:-CompactStrings

              Assignee:
              Aleksei Voitylov
              Reporter:
              Aleksei Voitylov
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