[ARM] Allow zext in ARMCodeGenPrepare
Treat zext instructions as roots, like we do for truncs. Differential Revision: https://reviews.llvm.org/D50759 llvm-svn: 339868
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Treat zext instructions as roots, like we do for truncs. Differential Revision: https://reviews.llvm.org/D50759 llvm-svn: 339868