[test/vptr-non-unique-typeinfo] Address Samsonov's post-commit review

[rnk]

lgtm

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/Helpers/lit.local.cfg

-# Sources in this directory are helper files for tests which test functionality
-# involving multiple translation units.
-config.suffixes = []

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/Helpers/vptr-non-unique-typeinfo-lib.h

-struct X {
-  virtual ~X() {}
-};
-X *libCall();

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/Helpers/vptr-non-unique-typeinfo-lib.cpp

-#include "vptr-non-unique-typeinfo-lib.h"
-
-X *libCall() {
-  return new X;
-}

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/vptr-non-unique-typeinfo.cpp

-// RUN: %clangxx -frtti -fsanitize=vptr -fno-sanitize-recover=vptr -I%p/Helpers %p/Helpers/vptr-non-unique-typeinfo-lib.cpp -fPIC -shared -o %t-lib.so
+// RUN: %clangxx -frtti -fsanitize=vptr -fno-sanitize-recover=vptr -I%p/Helpers -g %s -fPIC -shared -o %t-lib.so -DBUILD_SO
 // RUN: %clangxx -frtti -fsanitize=vptr -fno-sanitize-recover=vptr -I%p/Helpers -g %s -O3 -o %t %t-lib.so
 // RUN: %run %t
 //
 // REQUIRES: cxxabi
 
-#include "vptr-non-unique-typeinfo-lib.h"
+struct X {
+  virtual ~X() {}
+};
+X *libCall();
+
+#ifdef BUILD_SO
+
+X *libCall() {
+  return new X;
+}
+
+#else
 
 int main() {
   X *px = libCall();
   delete px;
 }
+
+#endif