Subzero: Fix compiler warnings.

src/IceTargetLoweringMIPS32.cpp

 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 4044 matching lines @@
     lowerAssign(Assign);
     return;
   }
   llvm::report_fatal_error("InsertElement requires a constant index");
 }
 
 void TargetMIPS32::lowerIntrinsicCall(const InstIntrinsicCall *Instr) {
   Variable *Dest = Instr->getDest();
   Type DestTy = (Dest == nullptr) ? IceType_void : Dest->getType();
   switch (Instr->getIntrinsicInfo().ID) {
-  default:
-    llvm::report_fatal_error("Unexpected intrinsic");
-    return;
   case Intrinsics::AtomicCmpxchg: {
     UnimplementedLoweringError(this, Instr);
     return;
   }
   case Intrinsics::AtomicFence:
     UnimplementedLoweringError(this, Instr);
     return;
   case Intrinsics::AtomicFenceAll:
     // NOTE: FenceAll should prevent and load/store from being moved across the
     // fence (both atomic and non-atomic). The InstMIPS32Mfence instruction is
@@ skipping 278 matching lines @@
     return;
   }
   case Intrinsics::LoadSubVector: {
     UnimplementedLoweringError(this, Instr); // Not required for PNaCl
     return;
   }
   case Intrinsics::StoreSubVector: {
     UnimplementedLoweringError(this, Instr); // Not required for PNaCl
     return;
   }
-  case Intrinsics::UnknownIntrinsic:
-    Func->setError("Should not be lowering UnknownIntrinsic");
+  default: // UnknownIntrinsic
+    Func->setError("Unexpected intrinsic");
     return;
   }
   return;
 }
 
 void TargetMIPS32::lowerLoad(const InstLoad *Instr) {
   // A Load instruction can be treated the same as an Assign instruction, after
   // the source operand is transformed into an OperandMIPS32Mem operand.
   Type Ty = Instr->getDest()->getType();
   Operand *Src0 = formMemoryOperand(Instr->getSourceAddress(), Ty);
@@ skipping 867 matching lines @@
   Str << "\t.set\t"
       << "nomips16\n";
 }
 
 SmallBitVector TargetMIPS32::TypeToRegisterSet[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::RegisterAliases[RegMIPS32::Reg_NUM];
 
 } // end of namespace MIPS32
 } // end of namespace Ice