[PATCH] D139827: [RISCV][Asan] Use dynamic shadow offset to make it work on different width of virtual-memory system.

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

> The original asan port was support Sv39 only, however Sv48 support has landed to linux kernel[1] for a while, so we are trying to make it support both Sv39 and Sv48,

Supporting too many address space bits can introduce significant hidden maintenance burden and performance implication, e.g. using SizeClassAllocator32 for LeakSanitizer (standalone or asan/hwasan integrated) is extremely slow.
See `D137666` that AArch64 msan dropped `<48`-bit VMA. A line needs to be drawn.


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https://reviews.llvm.org/D139827