[clang] [Clang] Re-land Overflow Pattern Exclusions (PR #104889)

[Vitaly Buka via cfe-commits]

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@@ -367,6 +367,21 @@ class LangOptionsBase {
     PerThread,
   };
 
+  /// Exclude certain code patterns from being instrumented by arithmetic
+  /// overflow sanitizers
+  enum OverflowPatternExclusionKind {
+    /// Don't exclude any overflow patterns from sanitizers
+    None = 1 << 0,
+    /// Exclude all overflow patterns (below)
+    All = 1 << 1,
+    /// if (a + b < a)
+    AddOverflowTest = 1 << 2,
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vitalybuka wrote:

As above

https://github.com/llvm/llvm-project/pull/104889