[compiler-rt] [flang] [clang-tools-extra] [clang] [llvm] [libcxx] [libc] [Clang] Generate the GEP instead of adding AST nodes (PR #73730)

[Eli Friedman via cfe-commits]

================
@@ -4022,8 +4169,36 @@ LValue CodeGenFunction::EmitArraySubscriptExpr(const 
ArraySubscriptExpr *E,
       ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
     else
       ArrayLV = EmitLValue(Array);
+
     auto *Idx = EmitIdxAfterBase(/*Promote*/true);
 
+    if (SanOpts.has(SanitizerKind::ArrayBounds)) {
----------------
efriedma-quic wrote:

In general, emitting an expression twice can miscompile and/or crash the 
compiler.  I'm not concerned about performance optimizations.

https://github.com/llvm/llvm-project/pull/73730
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