https://bugs.llvm.org/show_bug.cgi?id=36250

            Bug ID: 36250
           Summary: DAGCombiner::SimplifySetCC fails for illegal integer
                    types not compatible with getShiftAmountTy
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedb...@nondot.org
          Reporter: llvm-...@redking.me.uk
                CC: joker....@gmail.com, llvm-bugs@lists.llvm.org,
                    spatel+l...@rotateright.com

Reduced from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5787

define void @f() {
   %1 = load i448, i448* undef
   %2 = sub i448 0, %1
   %3 = icmp eq i448 %1, %2
   store i1 %3, i1* undef
   ret void
}

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