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DWARF register number by emitting a super-register + DW_OP_bit_piece. This is necessary because on x86_64, there are no DWARF register numbers for i386-style subregisters. Fixes a bunch of FIXMEs. rdar://problem/16015314 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201180 91177308-0d34-0410-b5e6-96231b3b80d8