[jdk11u-dev] RFR: 8261160: Add a deserialization JFR event

[Goetz Lindenmaier]

I backport this for parity with 11.0.17-oracle.

It needed a row of adaptions, but none touching the base functionality.

src/java.base/share/classes/java/io/ObjectInputStream.java
Resolved an import. Trivial.

src/jdk.jfr/share/classes/jdk/jfr/internal/instrument/JDKEvents.java
In this file some cleanup wrt alphabetic ordering was made that does 
not apply to 11. (ProcessStartEvent not in 11.)

test/jdk/jdk/jfr/event/io/TestDeserializationEvent.java
I adapted this test to Java 11 syntax.
It used records and modern instanceof statements.
Also, I included /test/lib/jdk/test/lib/serial/SerialObjectBuilder.java
from "JDK-8254234: Add test library stream object builder".
In that file, I also removed the record and replaced
Class.descriptorString() by a local implementation. DescriptorString() was
introduced in 12.  Backporting 8254234
as prerequisite makes no sense as the adapted test is not 
in 11, thus the backport would be quite incomplete.

test/jdk/jdk/jfr/event/metadata/TestDefaultConfigurations.java
test/jdk/jdk/jfr/event/runtime/TestActiveSettingEvent.java
Resolved due to context (ProcessStartEvent not in 11.)

test/lib/jdk/test/lib/jfr/EventNames.java
Resolved due to context (DirectBufferStatistics not in 11.)

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Commit messages:
 - Backport 3dc6f52a89e4baab1a5501880824f8d1a68e6356

Changes: https://git.openjdk.org/jdk11u-dev/pull/1150/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1150&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8261160
  Stats: 850 lines in 13 files changed: 831 ins; 4 del; 15 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1150.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1150/head:pull/1150

PR: https://git.openjdk.org/jdk11u-dev/pull/1150