[clang] [clang][ExprConst] allow single element access of vector object to be constant expression (PR #101126)

[Shafik Yaghmour via cfe-commits]

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@@ -442,6 +446,16 @@ namespace {
       MostDerivedArraySize = 2;
       MostDerivedPathLength = Entries.size();
     }
+
+    void addVectorElementUnchecked(QualType EltTy, uint64_t Size,
+                                   uint64_t Idx) {
+      Entries.push_back(PathEntry::ArrayIndex(Idx));
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shafik wrote:

@sethp had a comment in the previous PR that is not address here: https://github.com/llvm/llvm-project/pull/72607#issuecomment-2175994595

https://github.com/llvm/llvm-project/pull/101126