[CodeGenPrepare] Teach the addressing mode matcher how to promote zext.
I.e., teach it about 'sext (zext a to ty) to ty2' => zext a to ty2. llvm-svn: 217629
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I.e., teach it about 'sext (zext a to ty) to ty2' => zext a to ty2. llvm-svn: 217629