Revert "[ThinLTO] Internalize readonly globals"

This reverts commit 10c84a8f35cae4a9fc421648d9608fccda3925f2.

llvm-svn: 346768
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index b817c46..8017527 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -646,8 +646,7 @@
   auto isPrevailing = [&](GlobalValue::GUID G) {
     return PrevailingType::Unknown;
   };
-  computeDeadSymbolsWithConstProp(Index, GUIDPreservedSymbols, isPrevailing,
-                                  /* ImportEnabled = */ true);
+  computeDeadSymbols(Index, GUIDPreservedSymbols, isPrevailing);
 }
 
 /**