RFR: 8301703: java.base jdk.internal.foreign.abi.BindingSpecializer uses ASM to generate classes

[Jorn Vernee]

Rewrite BindingSpecializer to use the new class file API.

Note: There is a big try/catch/finally block generated in the `specialize` method that currently uses labels. I looked at replacing this with a call to `CodeBuilder::trying` but it would require threading the nested code builders through all the `emit*` methods, which currently access the 'global' CodeBuilder instance attached to the BindingSpecializer instance. Since there didn't really seem to be a big benefit to this, I've kept that try/catch/finally block as is, using labels.

The current implementation could also use `CheckClassAdapter` to do additional verification on the generated bytecode (ahead of the VM's verifier). I'm not sure if the new API has a replacement for that?

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Depends on: https://git.openjdk.org/jdk/pull/13079

Commit messages:
 - use ifThen to release scopes
 - use TypeKind.from
 - Translate BindingSpecializer to new classfile API

Changes: https://git.openjdk.org/jdk/pull/13247/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13247&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301703
  Stats: 411 lines in 1 file changed: 22 ins; 154 del; 235 mod
  Patch: https://git.openjdk.org/jdk/pull/13247.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13247/head:pull/13247

PR: https://git.openjdk.org/jdk/pull/13247