[Clang][CodeGen] Preserve alignment information for pointer arithmetics (#152575) Previously, the alignment of pointer arithmetics was inferred from the pointee type, losing the alignment information from its operands: https://github.com/llvm/llvm-project/blob/503c0908c3450d228debd64baecf41df8f58476e/clang/lib/CodeGen/CGExpr.cpp#L1446-L1449 This patch preserves alignment information for pointer arithmetics `P +/- C`, to match the behavior of identical array subscript `&P[C]`: https://godbolt.org/z/xx1hfTrx4. Closes https://github.com/llvm/llvm-project/issues/152330. Although the motivating case can be fixed by https://github.com/llvm/llvm-project/pull/145733, the alignment cannot be recovered without a dominating memory access with larger alignment.
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