[clang] [llvm] [LLVM] Add validation to check the number of intrinsic args (PR #196563)

[Andy Kaylor via cfe-commits]

================
@@ -398,6 +397,8 @@ DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
     unsigned OverloadIndex = Infos[NextElt++];
     OutputTable.push_back(
         IITDescriptor::get(IITDescriptor::SameVecWidth, OverloadIndex));
+    // IIT_SAME_VEC_WIDTH_ARG entry is followed by the element type.
+    DecodeIITType(NextElt, Infos, OutputTable);
----------------
andykaylor wrote:

This is fixing a bug, right? Maybe it should be a separate commit.

https://github.com/llvm/llvm-project/pull/196563