[clang] [compiler-rt] [Sanitizer] add signed-integer-wrap sanitizer (PR #80089)

[Nick Desaulniers via cfe-commits]

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@@ -0,0 +1,77 @@
+// Check that -fsanitize=signed-integer-wrap instruments with -fwrapv
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nickdesaulniers wrote:

Have you seen `llvm/utils/update_cc_test_checks.py` before?  Honestly, ALL new tests to clang (or llvm) involving codegen should strive to use that (or `update_any_test_checks.py` which I believe will now determine the correct underlying `update_*_test_checks.py` to use).

https://github.com/llvm/llvm-project/pull/80089