[TTI] Add VectorInstrContext for context-aware insert/extract costs. (#175982) This commit introduces the VectorInstrContext (VIC) infrastructure to improve cost estimates for insert/extracts based on the context instruction in which the insert/extract is used. This is similar to CastContextHint, and allows providing context on how the insert/extract is going to be used before creating IR. This is useful in the LoopVectorizer, where costs need to estimated before creating IR. The new hint currently only replaces an existing check in AArch64, but new uses will be introduced in follow-ups, including https://github.com/llvm/llvm-project/pull/177201. PR: https://github.com/llvm/llvm-project/pull/175982
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