This makes various improvements to help truffle do partial
evaluation of code related to typechecking.
* Split `UnionTypeNode` into `UnionTypeNodeExploded` and
`UnionTypeNodeLooped` to avoid gigantic graphs. This especially helps
in the case of typealiases, because they are inlined into their usage
sites.
* Move constraint-failure exception construction in
`TypeConstraintNode` behind `@TruffleBoundary` helper methods
instead of `transferToInterpreterAndInvalidate`, since building the
exception is a rare, off-hot-path operation.
* Move `ClassNode`'s one-time class-initialization logic behind a
`@TruffleBoundary` method (`initClass`), store `VmLanguage` as a
field instead of recomputing it via `VmLanguage.get(this)`, and use
`transferToInterpreterAndInvalidate` since class init never needs to
re-run on the compiled path.
* Pass `VmLanguage` explicitly into `TypeTestNode` and `ClassNode`
(via `AstBuilder`) rather than resolving it with
`VmLanguage.get(this)` on a hot path.
* Fix various issues where the partial evaluator determines that a frame
should have been materialized but was not.
* Pre-initialize call targets in `ObjectMember.setMemberNode()` and
`FunctionLiteralNode` so the first invocation doesn't trigger a
compilation invalidation.
* Fix truffle node tree issues (don't mark `@RootNode` as child,
deepCopy instead of passing an already adopted node).
* Remove unnecessary interpreter transfers when throwing type mismatch exceptions
Daniel Chao
b8c7a42318