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/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 1291303..904e917 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -881,9 +881,7 @@
 
   bool needsLowering = false;
   switch (VT.getSimpleVT().SimpleTy) {
-    default:
-      assert(false && "Unhandled load/store type!");
-      break;
+    default: llvm_unreachable("Unhandled load/store type!");
     case MVT::i1:
     case MVT::i8:
     case MVT::i16: