[clang] Sanitizer: Support -fwrapv with -fsanitize=signed-integer-overflow (PR #82432)

[Justin Stitt via cfe-commits]

================
@@ -70,6 +77,7 @@ void test1(void) {
   // WRAPV: add i8 {{.*}}, 1
----------------
JustinStitt wrote:

How's [1d9cb0a](https://github.com/llvm/llvm-project/pull/82432/commits/1d9cb0aca8985aa1636780b3ff9a863962cc2d57) look?

https://github.com/llvm/llvm-project/pull/82432