[dart2wasm] Fix bug in `@pragma('wasm:static-dispatch')` & remove corresponding dispatch table entries
There was a bug in `CallTarget.signature` which triggers if there's only
one entry that's statically dispatched against, which causes us to
inline the polymorphic dispatcher, which relies on this (previously
incorrect) signature.
The CL also changes the dispatch table building logic to not allocate
table entries for the statically dispatched regions (as they would
never be used).
Change-Id: Ic2d0c387e8863e89ef811e1892642fe81df9189a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/468000
Reviewed-by: Ömer Ağacan <omersa@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
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