Add a new "available_externally" linkage type. This is intended

to support C99 inline, GNU extern inline, etc.  Related bugzilla's
include PR3517, PR3100, & PR2933.  Nothing uses this yet, but it
appears to work.

llvm-svn: 68940

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -70,6 +70,7 @@ static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
   case 9: return GlobalValue::PrivateLinkage;
   case 10: return GlobalValue::WeakODRLinkage;
   case 11: return GlobalValue::LinkOnceODRLinkage;
+  case 12: return GlobalValue::AvailableExternallyLinkage;
   }
 }