[llvm-bugs] [Bug 30374] New: v8.1a CASP accepts register pairs with non-even low register (UNALLOCATED according to spec)

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https://llvm.org/bugs/show_bug.cgi?id=30374

            Bug ID: 30374
           Summary: v8.1a CASP accepts register pairs with non-even low
                    register (UNALLOCATED according to spec)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: ahmed.bougacha at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Stumbled upon this while looking at r281301, which has pairs like "%w19_w20". 
>From my reading of DDI0557A.b B11.1.4 "CASP, CASPA, CASPAL, CASPL", that's not
valid:

  if Rs<0> == ‘1’ then UNALLOCATED;
  if Rt<0> == ‘1’ then UNALLOCATED;

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