[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

0 files changed, 0 insertions, 0 deletions