git: openjdk/leyden: computed-constants: Add Constant::setOrDiscard

[duke]

Changeset: caf6f10d
Author:    Per Minborg <pminborg at gmail.com>
Date:      2023-12-11 17:14:44 +0000
URL:       https://git.openjdk.org/leyden/commit/caf6f10d0376c1fa4e75c20433f2fd5225e7b86a

Add Constant::setOrDiscard

! src/java.base/share/classes/java/lang/Constant.java
! src/java.base/share/classes/jdk/internal/constant/StandardConstant.java
! test/jdk/java/lang/ComputedConstant/ConstantTest.java