git: openjdk/jdk-sandbox: classfile-api-dev-branch: cleanup in CodeBuilder::constantInstruction

[Adam Sotona]

Changeset: e22380c3
Author:    Adam Sotona <asotona at openjdk.org>
Date:      2022-09-01 15:19:16 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/e22380c3cf033f8973ce6c59fb23ed5e681657bb

cleanup in CodeBuilder::constantInstruction
added support for ConstatntDescs.NULL
added CodeBuilder::ldc(LoadableConstantEntry)

! src/java.base/share/classes/jdk/classfile/CodeBuilder.java
! src/java.base/share/classes/jdk/classfile/Opcode.java
! src/java.base/share/classes/jdk/classfile/impl/AbstractInstruction.java
! src/java.base/share/classes/jdk/classfile/impl/BytecodeHelpers.java
! src/java.base/share/classes/jdk/classfile/instruction/ConstantInstruction.java