Latest JDK11 builds fail due to missing String.valueOfCodePoint(int) method

[andrew-m-leonard]

OpenJDK11 has added a new method to String that our J9 impl needs to implement.
Build from repo https://github.ibm.com/runtimes/openj9-openjdk branch openj9-jdk to reproduce ...

=== Output from failing command(s) repeated here ===
* For target jdk_modules_java.base__the.java.base_batch:
/home/admin/mydocker/ccm/openj9-openjdk/src/java.base/share/classes/java/lang/Character.java:7597: error: cannot find symbol
        return String.valueOfCodePoint(codePoint);
                     ^
  symbol:   method valueOfCodePoint(int)
  location: class String
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

* All command lines available in /home/admin/mydocker/ccm/openj9-openjdk/build/linux-x86_64-normal-server-release/make-support/failure-logs.
=== End of repeated output ===

[DanHeidinga]

@JasonFengJ9 FYI

[JasonFengJ9]

Looking at it.