[clang] [compiler-rt] [ASan] Document define to disable container overflow checks at compile time. (PR #163468)

[Louis Dionne via cfe-commits]

================
@@ -0,0 +1,50 @@
+// Test crash gives guidance on -D__ASAN_DISABLE_CONTAINER_OVERFLOW__ and
----------------
ldionne wrote:

Thanks for adding these tests.

https://github.com/llvm/llvm-project/pull/163468