Error in backend: Cannot select RRCL

[mskvortsov]

Input:

extern const char _ctype_[];
int
isblank (int c)
{
 return (((_ctype_)[c+1] & 0200) || (c == '\t'));
}

Command line: clang -O2 -c isblank.c
Message:

fatal error: error in backend: Cannot select: t28: i8 = MSP430ISD::RRCL t9
  t9: i8,ch = load<(load 1 from %ir.arrayidx, !tbaa !2)> t0, t23, undef:i16
    t23: i16 = add t2, t43
      t2: i16,ch = CopyFromReg t0, Register:i16 %0
        t1: i16 = Register %0
      t43: i16 = MSP430ISD::Wrapper TargetGlobalAddress:i16<[0 x i8]* @_ctype_> + 1
        t42: i16 = TargetGlobalAddress<[0 x i8]* @_ctype_> + 1
    t8: i16 = undef

[mskvortsov]

In #4 I completely forgot about 8-bit variant of rrcl.