[dart2wasm] Allow pkg/dart2wasm/tool/compile_benchmark to run from source via --src
Normally it uses the AOT runtime & dart2wasm AOT snapshot, which takes
long to build. (similar reason why one doesn't want to use `dart compile
wasm` in dev cycle)
Fixes also bug in script that used $BINARYEN_FLAGS instead of
"${BINARYEN_FLAGS[@]}" - which caused wasm-opt to run without
any flags.
Change-Id: Id6e03dbc01f7dba22de380453260278858dc0aa9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/348480
Reviewed-by: Slava Egorov <vegorov@google.com>
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