wasm-linker: fix storing atoms in the correct segment #14838
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When a decl is `undefined` is must be stored in the data segment when the build mode is safe. For unsafe optimize modes, it must be stored in the bss segment instead. For mutable decls where the atom contains all zeroes, it must always be stored in the bss segment. All other values will result in the atom being stored in the data segment.
Updates the linker test to verify the various cases where we must store the data in the bss segment.
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Closes #14834