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When MergeConsecutiveStores() combines two loads and two stores into wider loads and stores, the chain users of both of the original loads must be transfered to the new load, because it may be that a chain user only depends on one of the loads. New test case: test/CodeGen/SystemZ/dag-combine-01.ll Reviewed by James Y Knight. Bugzilla: https://llvm.org/bugs/show_bug.cgi?id=25310#c6 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253779 91177308-0d34-0410-b5e6-96231b3b80d8
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