[compiler-rt] asan_static x86-64: Support 64-bit ASAN_SHADOW_OFFSET_CONST (PR #75748)

[Rainer Orth via llvm-commits]

rorth wrote:

Unfortunately, this is not enough: `ASAN_MEMORY_ACCESS_CHECK_ADD` also leads to the same error from `gas`.

https://github.com/llvm/llvm-project/pull/75748