[dart2wasm] Update Binaryen options for benchmarking Remove the `--nominal` option, since this is obsolete and incompatible with the singleton recursion groups we use for async and FFI support. Add the `--type-ssa` and `--type-merging` optimization flags, which improve the precision of Binaryen's type flow analysis and subsequent devirtualization of method and closure calls. Also fix a path error in the `compile_benchmark` script. Change-Id: I8e9ac2278f9d68c9880760a0547b5911aee48a8e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/279015 Reviewed-by: Joshua Litt <joshualitt@google.com> Commit-Queue: Aske Simon Christensen <askesc@google.com>
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