Merging r322003:

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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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@322693 91177308-0d34-0410-b5e6-96231b3b80d8