RFR: 8339217: Optimize ClassFile API loadConstant

[Shaojin Wen]

This is a large method. By splitting it into multiple methods with the same name, the caller can automatically select based on the different types of parameters, avoiding this large call that cannot be inlined, which can also improve startup performance.

* current

CodeBuilder {
    default CodeBuilder loadConstant(ConstantDesc value) { ... }
}

java.lang.classfile.CodeBuilder::loadConstant (465 bytes)   failed to inline: callee is too large

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Commit messages:
 - since 24
 - optimize loadConstant

Changes: https://git.openjdk.org/jdk/pull/20761/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20761&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339217
  Stats: 67 lines in 2 files changed: 36 ins; 0 del; 31 mod
  Patch: https://git.openjdk.org/jdk/pull/20761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20761/head:pull/20761

PR: https://git.openjdk.org/jdk/pull/20761