Add fast path for the most common type of adapter frame.
Monomorphize many of the interpreter bytecodes.
Cleanup.
Typing fallout.
Use PC instead of BCI in the interpreter.
Renaming.
Process wide opcode out of line.
More cleanup, add bigram optimizations.
Cleanup and move resolve closures outside of the interpreter method.
Pull out return value checking.
Cache argument slot count on methodInfos for faster access.
Misc.