[dart2wasm] Some fixes and enhancements to inlining
This changes a number of things in dart2wasm's internal inliner:
- Fixed a few places that access the outputs of the current function
to take inlining into account.
- Don't inline functions that contain local functions or function
literals, since the mechanism does not support this situation.
- Don't inline a function if it's already on the stack of functions
being generated.
- When a function is inlined, don't put it on the worklist, so we
don't generate bodies for functions that are inlined at all calls.
- Recognize `@pragma("wasm:prefer-inline")` and inline functions
marked with this annotation.
- Enabled inlining by default.
- Set the default inlining limit to 0, so small functions are not
heuristically inlined by default.
Later changes will add annotations to selectively inline functions
that particularly benefit from it.
Change-Id: If8829833da5f8b8e4ce0655154fdc430db8928cc
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/278909
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
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