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* It had already the assumption there's a `.` in the name but didn't check for it => Validate that the output file ends with `.wasm` * Make the unoptimized wasm (if emitted) be `.unopt.wasm` => It's a wasm file, so it should have a .wasm extension This is a step towards making flutter use `dart compile wasm` directly without the AOT snapshot of pkg/dart2wasm/bin/dart2wasm and wasm-opt separately. Which will allow removing of the duplicated wasm-opt flag list in flutter. Change-Id: I685bb1aaa9d95ab43936bab68add916a642eb296 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/347280 Reviewed-by: Michael Thomsen <mit@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>