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

[Justin Stitt via cfe-commits]

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+// Check that -fsanitize=signed-integer-wrap instruments with -fwrapv
+// RUN: %clang_cc1 -fwrapv -triple x86_64-apple-darwin -emit-llvm -o - %s -fsanitize=signed-integer-wrap | FileCheck %s --check-prefix=CHECKSIW
+
+// Check that -fsanitize=signed-integer-overflow doesn't instrument with -fwrapv
+// RUN: %clang_cc1 -fwrapv -triple x86_64-apple-darwin -emit-llvm -o - %s -fsanitize=signed-integer-overflow | FileCheck %s --check-prefix=CHECKSIO
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JustinStitt wrote:

My patch does not touch SIO but in my testing I wanted it to be clear that SIO and SIW behave differently when `-fwrapv` is enabled. The tests more or less show this difference .

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