https://bugs.llvm.org/show_bug.cgi?id=34571

            Bug ID: 34571
           Summary: Missing mnemonic RDPID
           Product: libraries
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedb...@nondot.org
          Reporter: kadircetinkaya.06...@gmail.com
                CC: llvm-bugs@lists.llvm.org

RDPID RAX

cannot be assembled, fails with invalid instruction mnemonic 'rdpid' does not
exists. but as mentioned in July 2017 version of the Instruction Set Reference
page 1188. This mnemonic exists with following encoding specificaitons:

F3 0F C7 /7 - RDPID r32
F3 0F C7 /7 - RDPID r64

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