Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149961 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMMCInstLower.cpp b/lib/Target/ARM/ARMMCInstLower.cpp
index a63a94d..e2ac9a4 100644
--- a/lib/Target/ARM/ARMMCInstLower.cpp
+++ b/lib/Target/ARM/ARMMCInstLower.cpp
@@ -31,8 +31,7 @@
     Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
                                    OutContext);
     switch (MO.getTargetFlags()) {
-    default:
-      assert(0 && "Unknown target flag on symbol operand");
+    default: llvm_unreachable("Unknown target flag on symbol operand");
     case 0:
       break;
     case ARMII::MO_LO16:
@@ -67,9 +66,7 @@
 bool ARMAsmPrinter::lowerOperand(const MachineOperand &MO,
                                  MCOperand &MCOp) {
   switch (MO.getType()) {
-  default:
-    assert(0 && "unknown operand type");
-    return false;
+  default: llvm_unreachable("unknown operand type");
   case MachineOperand::MO_Register:
     // Ignore all non-CPSR implicit register operands.
     if (MO.isImplicit() && MO.getReg() != ARM::CPSR)