[compiler-rt] [HWASAN] Add test to detected use after free in memcmp (PR #67204)

[Florian Mayer via llvm-commits]

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@@ -0,0 +1,15 @@
+// RUN: %clangxx -O0 %s -o %t && %run %t
+// XFAIL: *
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fmayer wrote:

I guess it's not likely to segfault, but the allocator could in principle return the page on delete.

https://github.com/llvm/llvm-project/pull/67204