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Visibly fail if attempting to encode register AH,BH,CH,DH in a REX-prefixed…

Authored by dougk on Nov 11 2015, 7:51 AM.

Description

Visibly fail if attempting to encode register AH,BH,CH,DH in a REX-prefixed instruction.

Differential Revision: http://reviews.llvm.org/D13316
Fixes PR25003

llvm-svn: 252743