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Use llvm-objcpy to strip the producers section when not running wasm-…
…opt (#12075) As part of WebAssembly/binaryen#3043 we stopped stripping the producers section in unoptimized builds in #11996 However there is a way to still strip it with very little overhead, using llvm-objcpy. This PR makes us strip it using wasm-opt normally if we are running wasm-opt anyhow, but if we are not (as we hope to get to soon in some builds) then it uses llvm-objcpy. This does a little more work after link but it's pretty trivial and does not rewrite code or anything like that. This does add some complexity, but it is complexity we'll need anyhow for not running wasm-opt when it isn't needed. Fixes #12071
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