MS ABI: Implement __GetExceptionInfo for std::make_exception_ptr

std::make_exception_ptr calls std::__GetExceptionInfo in order to figure
out how to properly copy the exception object.

Differential Revision: http://reviews.llvm.org/D8280

llvm-svn: 232188
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index 1f5d678..6b53359 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -644,7 +644,7 @@
 
   llvm::GlobalVariable *getCatchableTypeArray(QualType T);
 
-  llvm::GlobalVariable *getThrowInfo(QualType T);
+  llvm::GlobalVariable *getThrowInfo(QualType T) override;
 
 private:
   typedef std::pair<const CXXRecordDecl *, CharUnits> VFTableIdTy;