Merging r322003:
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    r322003 | niravd | 2018-01-08 08:21:35 -0800 (Mon, 08 Jan 2018) | 11 lines
    
    [DAG] Teach BaseIndexOffset to correctly handle with indexed operations
    
    BaseIndexOffset address analysis incorrectly ignores offsets folded
    into indexed memory operations causing potential errors in alias
    analysis of pre-indexed operations.
    
    Reviewers: efriedma, RKSimon, hfinkel, jyknight
    
    Subscribers: hiraditya, javed.absar, llvm-commits
    
    Differential Revision: https://reviews.llvm.org/D41701
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    llvm-svn: 322693