[lworld] Merge the experimental bytecode API

LWorld prototype has two copies of the experimental bytecode API

1) src/java.base/share/classes/jdk/experimental/bytecode:

This has been updated with lworld semantics

2) test/jdk/lib/testlibrary/bytecode/jdk/experimental/bytecode:

This contains old MVT based Q-Types, and has been updated for use by Condy testing in mainline.

1) needs to be merge with 2), and then remove 1). Old MVT Q-types need to go.