Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149816 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DIE.cpp b/lib/CodeGen/AsmPrinter/DIE.cpp
index 331b07c..3776848 100644
--- a/lib/CodeGen/AsmPrinter/DIE.cpp
+++ b/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -310,7 +310,7 @@
 ///
 void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const {
   switch (Form) {
-  default: assert(0 && "Improper form for block");    break;
+  default: llvm_unreachable("Improper form for block");
   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;