Migrate ABIName to MCTargetOptions so that it can be shared between
the TargetMachine level and the MC level.

llvm-svn: 225891
diff --git a/llvm/lib/MC/MCTargetOptions.cpp b/llvm/lib/MC/MCTargetOptions.cpp
index 3093ba2b..1258d9e 100644
--- a/llvm/lib/MC/MCTargetOptions.cpp
+++ b/llvm/lib/MC/MCTargetOptions.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/ADT/StringRef.h"
 #include "llvm/MC/MCTargetOptions.h"
 
 namespace llvm {
@@ -15,6 +16,10 @@
     : SanitizeAddress(false), MCRelaxAll(false), MCNoExecStack(false),
       MCFatalWarnings(false), MCSaveTempLabels(false),
       MCUseDwarfDirectory(false), ShowMCEncoding(false), ShowMCInst(false),
-      AsmVerbose(false), DwarfVersion(0) {}
+      AsmVerbose(false), DwarfVersion(0), ABIName() {}
+
+StringRef MCTargetOptions::getABIName() const {
+  return ABIName;
+}
 
 } // end namespace llvm