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

[Adam Sotona]

Changeset: c148bc28
Author:    Adam Sotona <asotona at openjdk.org>
Date:      2022-09-01 15:19:16 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/c148bc28f6462d5558a0cbe025f758430a4ffac3

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