llvm-project

ddf1de20 - [hwasan] Fix rare false negative (zero tag) in stack-uar.c (#69374)

[hwasan] Fix rare false negative (zero tag) in stack-uar.c (#69374) stack-uar.c is flaky (1 in 256 executions) because the random tag may be zero (https://github.com/llvm/llvm-project/issues/69221). This patch works around the issue in the same way as deep-recursion.c (https://github.com/llvm/llvm-project/commit/aa4dfd3736dd1c2e0263eacd09bd613c5784ea73), by falling back to a neighboring object, which must have a different (non-zero) tag. This patch also does a minor cleanup of the aforementioned deep-recursion.c, for consistency with stack-uar.c. Co-authored-by: Thurston Dang <thurston@google.com>