[RISC-V][HWASAN] Add runtime support for HWASAN for RISC-V

[smd]

Summary

[4/9] patch series to port HWASAN for riscv64

Depends On D131341

[smd]

Updating the patch

[vitalybuka]

compiler-rt/lib/hwasan/hwasan.h

171

Could you please to move HwasanTagMismatch change into a separate patch as it's slightly affects all platforms

[smd]

Addressing comments

[smd]

compiler-rt/lib/hwasan/hwasan.h

171

Fixed, thanks.

[vitalybuka]

LGTM, from sanitizers, but consider adding as blocking reviewer someone with RISCV expertise

[luismarques]

compiler-rt/lib/hwasan/hwasan_checks.h

44

using a register asm variable like in the aarch64 code would avoid the move instruction.

71–72

Ditto.

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

140–165

Nit: \n instead of ;?

[luismarques]

compiler-rt/lib/hwasan/hwasan_checks.h

76

I guess it won't really matter in this case but the n constraint should be an I constraint, to constraint it to a signed 12-bit immediate fit for the addiw.

[smd]

Addressing comments

[smd]

compiler-rt/lib/hwasan/hwasan_checks.h

44

Fixed, thanks.

71–72

Fixed, thanks

76

Fixed, thanks

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

140–165

Personally I'd go with ; since it's used in every other inline asm. Do you have objections?
Thanks

[luismarques]

I didn't notice any other issues but I have no experience with HWASan. Thanks!

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

140–165

No objection.