When transforming sext(trunc(load(x))) into sext(smaller load(x)),
the trunc is directly replaced with the smaller load, so don't try to create a new sext node. This fixes PR4050. llvm-svn: 70179
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the trunc is directly replaced with the smaller load, so don't try to create a new sext node. This fixes PR4050. llvm-svn: 70179