Virtual method overrides can no longer have mismatched calling conventions.  This fixes PR14339.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169705 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 9cfa278..6d883c8 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1806,8 +1806,8 @@
             CC == CC_X86Pascal) ? CCCR_OK : CCCR_Warning;
   }
 
-  virtual CallingConv getDefaultCallingConv() const {
-    return CC_C;
+  virtual CallingConv getDefaultCallingConv(CallingConvMethodType MT) const {
+    return MT == CCMT_Member ? CC_X86ThisCall : CC_C;
   }
 };
 
@@ -2896,8 +2896,8 @@
     return TargetInfo::checkCallingConvention(CC);
   }
 
-  virtual CallingConv getDefaultCallingConv() const {
-    return CC_Default;
+  virtual CallingConv getDefaultCallingConv(CallingConvMethodType MT) const {
+    return CC_C;
   }
 
 };