https://llvm.org/bugs/show_bug.cgi?id=30716

            Bug ID: 30716
           Summary: Invalid suffix 'l' on instructions accessing 16-bit
                    registers
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedb...@nondot.org
          Reporter: nholc...@wisc.edu
                CC: llvm-bugs@lists.llvm.org
    Classification: Unclassified

The below are two examples of decodings produced by LLVM where the instruction
is suffixed with 'l', but accesses a 16-bit register.

Bytes: 66 d1 d2
Output: rcll %dx

Bytes: 66 b8 09 35
Output: movl $13577, %sp

I suspect this is a result of ignoring the 0x66 prefix when choosing opcode
suffix.

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