Revert "Revert "Labels can be stored as 2 bytes instead of 4, since we only store the offset""

This reverts commit 83be06e4.

This commit was a mind slip. Label addresses are stored in the
relocations. Whether bytecode is stripped does not influence the
offsets. Offsets are guaranteed to be small enough.
11 jobs for master in 13 minutes and 12 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
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build

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build-clang

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build-wasm

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  Test Interpreter
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benchmark-wasm

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  Examples
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examples

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