[dfsan] Add origin tls/move/read APIs

This is a part of https://reviews.llvm.org/D95835.

1) TLS storage
2) a weak global used to set by instrumented code
3) move origins

These APIs are similar to MSan's APIs
We first improved MSan's by https://reviews.llvm.org/D94572 and https://reviews.llvm.org/D94552.
So the correctness has been verified by MSan.
After the DFSan instrument code is ready, we wil be adding more test

4) read

To reduce origin tracking cost, some of the read APIs return only
the origin from the first taint data.

Note that we did not add origin set APIs here because they are related
to code instrumentation, will be added later with IR transformation

Reviewed-by: morehouse

Differential Revision: https://reviews.llvm.org/D96564

GitOrigin-RevId: 063a6fa87ece8a452daba99df7fb99751ed10165
2 files changed