[clang] [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:

If you have `p->p->p->a.b.c.d.e[index]`, the count is something like 
`p->p->p->a.b.c.d.count`.  So you just use `p->p->p->a.b.c.d` as the base, GEP 
from there to "e" and "count".



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