[LLD][ELF] Include offset when adding Thunk symbols (#144995) Include the offset of a thunk in the ThunkSection when adding symbols. At Thunk creation time the offset is set to 0 as we don't know where in the ThunkSection the Thunk will end up. The symbol values are updated by the setOffset() call in assignOffsets(). When we transform a thunk from a short to a long, we sometimes add a mapping symbol. At this point the offset of the thunk is non zero and we need to account for that when defining the symbol, as the setOffset() call subtracts the offset before adding the new one back in. To test; added a second thunk that is converted to a long thunk to aarch64-thunk-bit-multipass. This second thunk is given a non zero offset from the start of the Thunk Section so we can observe the mapping symbol being put in the wrong place without accounting for the offset. fixes: https://github.com/llvm/llvm-project/issues/142326
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