[compiler-rt] [ASan] Fix crash in __asan_region_is_poisoned at application memory boundaries (PR #180223)

[Vitaly Buka via llvm-commits]

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@@ -270,6 +270,21 @@ extern "C" {
 
   SANITIZER_INTERFACE_ATTRIBUTE int __asan_update_allocation_context(
       void *addr);
+
+  // Used only for testing asan.
+  SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+  void *__asan_test_only_get_low_mem_beg();
+  SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+  void *__asan_test_only_get_low_mem_end();
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vitalybuka wrote:

we should not expand interface just for test

there are asan option to dump memory layout, maybe print and parse that one?

https://github.com/llvm/llvm-project/pull/180223