[weak vtables] Remove a bunch of weak vtables

This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file. The memory leaks in this version have been fixed. Thanks
Alexey for pointing them out.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

llvm-svn: 195064
diff --git a/llvm/utils/unittest/googletest/src/gtest-internal-inl.h b/llvm/utils/unittest/googletest/src/gtest-internal-inl.h
index 6554cfc..1bae630 100644
--- a/llvm/utils/unittest/googletest/src/gtest-internal-inl.h
+++ b/llvm/utils/unittest/googletest/src/gtest-internal-inl.h
@@ -408,7 +408,7 @@
 class OsStackTraceGetterInterface {
  public:
   OsStackTraceGetterInterface() {}
-  virtual ~OsStackTraceGetterInterface() {}
+  virtual ~OsStackTraceGetterInterface();
 
   // Returns the current OS stack trace as a String.  Parameters:
   //