Removing unused default switch cases in switches over enums that already account for all enumeration values explicitly.

(This time I believe I've checked all the -Wreturn-type warnings from GCC & added the couple of llvm_unreachables necessary to silence them. If I've missed any, I'll happily fix them as soon as I know about them)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148262 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp b/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
index 4d567c8..644eaad 100644
--- a/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp
@@ -24,7 +24,6 @@
 
 const char *DwarfAccelTable::Atom::AtomTypeString(enum AtomType AT) {
   switch (AT) {
-  default: llvm_unreachable("invalid AtomType!");
   case eAtomTypeNULL: return "eAtomTypeNULL";
   case eAtomTypeDIEOffset: return "eAtomTypeDIEOffset";
   case eAtomTypeCUOffset: return "eAtomTypeCUOffset";
@@ -32,6 +31,7 @@
   case eAtomTypeNameFlags: return "eAtomTypeNameFlags";
   case eAtomTypeTypeFlags: return "eAtomTypeTypeFlags";
   } 
+  llvm_unreachable("invalid AtomType!");
 }
 
 // The general case would need to have a less hard coded size for the