hg: jdk/submit: 8140281: add no-arg Optional.orElseThrow() as preferred alternative to get()

[stuart.marks at oracle.com]

Changeset: 7acf5700d542
Author:    smarks
Date:      2017-12-13 18:47 -0800
URL:       http://hg.openjdk.java.net/jdk/submit/rev/7acf5700d542

8140281: add no-arg Optional.orElseThrow() as preferred alternative to get()
Reviewed-by: alanb, bpb, forax, darcy

! src/java.base/share/classes/java/util/Optional.java
! src/java.base/share/classes/java/util/OptionalDouble.java
! src/java.base/share/classes/java/util/OptionalInt.java
! src/java.base/share/classes/java/util/OptionalLong.java
! test/jdk/java/util/Optional/Basic.java
! test/jdk/java/util/Optional/BasicDouble.java
! test/jdk/java/util/Optional/BasicInt.java
! test/jdk/java/util/Optional/BasicLong.java