[clang] [HLSL] error on out of bounds vector accesses (PR #128952)

[via cfe-commits]

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@@ -10635,6 +10635,12 @@ def err_block_on_vm : Error<
 def err_sizeless_nonlocal : Error<
   "non-local variable with sizeless type %0">;
 
+def err_vector_index_out_of_range : Error<
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joaosaffran wrote:

nit: this seems hlsl specific, I would expect this to be name something like: `err_hlsl_vector_index_out_of_range `

https://github.com/llvm/llvm-project/pull/128952