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

[Vikram Hegde 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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vikramRH wrote:

Yes, I thought about having a new accessor of the sort "vectorIndex" but all it seems to achieve is just adding new API that returns does the exact same thing as array (other than perhaps adding a new meaning to PathEntry value). I will update it if you feel this makes sense.

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