PSA: ASan and HWAsan output format changes

We are planning to submit ⚙ D132611 [ASan] rename left/right to before/after. and ⚙ D132622 [HWASan] rename left/right to before/after., which change the ASan/HWASan crash reports to refer to memory locations as before/after rather than to the left of/to the right of. Let me know if there are any concerns.