[PowerPC] Changed sema checking range for tdw td builtin

[Conanap]

Summary

To match xlc behaviour and definition in the PowerPC ISA3.1,
it is a better idea to have ibm-clang produce an error when a
0 is passed to the builtin, which will match xlc's behaviour.
This patch changes the accepted range from 0 to 31 to 1 to 31.

[Conanap]

Updated test cases

[NeHuang]

LGTM.

[amyk]

LGTM.

clang/lib/Sema/SemaChecking.cpp

bool Sema::CheckPPCBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
   case PPC::BI__builtin_altivec_vsldbi:
      return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
   case PPC::BI__builtin_altivec_vsrdbi:
      return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
   case PPC::BI__builtin_vsx_xxpermx:
      return SemaBuiltinConstantArgRange(TheCall, 3, 0, 7);
   case PPC::BI__builtin_ppc_tw:
   case PPC::BI__builtin_ppc_tdw:
-    return SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
+    return SemaBuiltinConstantArgRange(TheCall, 2, 1, 31);
   case PPC::BI__builtin_ppc_cmpeqb:
   case PPC::BI__builtin_ppc_setb:
   case PPC::BI__builtin_ppc_maddhd:
   case PPC::BI__builtin_ppc_maddhdu:
   case PPC::BI__builtin_ppc_maddld:
     return SemaFeatureCheck(*this, TheCall, "isa-v30-instructions",
                             diag::err_ppc_builtin_only_on_arch, "9");
   case PPC::BI__builtin_ppc_cmprb: