[clang] [Clang][CodeGen] Add workaround for old glibc `__PTR_ALIGN` macro (PR #137851)

[Eli Friedman via cfe-commits]

================
@@ -2247,6 +2247,15 @@ bool 
BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
     return false;
   }
 
+  // Workaround for old glibc's __PTR_ALIGN macro
+  if (auto *Select = dyn_cast<ConditionalOperator>(PExp->IgnoreParenCasts())) {
----------------
efriedma-quic wrote:

IgnoreParenNoopCasts(), maybe?

https://github.com/llvm/llvm-project/pull/137851
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