[clang] [compiler-rt] [compiler-rt:ubsan] Add -fsanitize=unaligned-pointer-subtraction to detect undefined subtraction of two pointers (PR #210635)

[Jerry Dang via cfe-commits]

================
@@ -5023,6 +5024,26 @@ Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
 
   if (CGF.getLangOpts().StablePointerSubtraction)
     return Builder.CreateSDiv(diffInChars, divisor, "sub.ptr.div");
+
+  // If the unaligned-pointer-subtraction sanitizer is on, verify at runtime
----------------
kuroyukiasuna wrote:

Addressed.

https://github.com/llvm/llvm-project/pull/210635
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