The ARM C++ ABI is sufficiently different from the Itanium C++ ABI that
it deserves its own enumerator.  Obviously the implementations should
closely follow the Itanium ABI except in cases of divergence.

llvm-svn: 111749
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 7c42a80..6d42883 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -58,6 +58,9 @@
 
   // Default to no types using fpret.
   RealTypeUsesObjCFPRet = 0;
+
+  // Default to using the Itanium ABI.
+  CXXABI = CXXABI_Itanium;
 }
 
 // Out of line virtual dtor for TargetInfo.