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ed665a15e8
This builds on the work on portable-intrinsics branch: - define WEBP_ENABLE_WASM_SIMD to enable WebAssembly optimizations, this defines a constant (WEBP_USE_WASM_SIMD) that we can use in the future to enable Wasm SIMD intrinsics - build dwebp with JS build - add a placeholder dec_wasm.c file, we don't do any special initialization so it will fall back to c functions - add Wasm to cpu checks, it needs to come before all checks since the Emscripten toolchain will emulate x86 systems Change-Id: I12de720304ff19fff82c8d100defbc60353787a9