Reapply "[LAA,Loads] Use loop guards and max BTC if needed when checking deref. (#155672)" This reverts commit f0df1e3dd4ec064821f673ced7d83e5a2cf6afa1. Recommit with extra check for SCEVCouldNotCompute. Test has been added in b16930204b. Original message: Remove the fall-back to constant max BTC if the backedge-taken-count cannot be computed. The constant max backedge-taken count is computed considering loop guards, so to avoid regressions we need to apply loop guards as needed. Also remove the special handling for Mul in willNotOverflow, as this should not longer be needed after 914374624f (https://github.com/llvm/llvm-project/pull/155300). PR: https://github.com/llvm/llvm-project/pull/155672
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