Change the internalize pass to internalize all symbols when given an empty
list of externals. This makes sense since a shared library with no symbols
can still be useful if it has static constructors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166795 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index 1d8f1e5..e3bc94e 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -245,8 +245,11 @@
   // Now that composite has been compiled, scan through the module, looking
   // for a main function.  If main is defined, mark all other functions
   // internal.
-  if (Internalize)
-    PM.add(createInternalizePass(true));
+  if (Internalize) {
+    std::vector<const char*> E;
+    E.push_back("main");
+    PM.add(createInternalizePass(E));
+  }
 
   // Propagate constants at call sites into the functions they call.  This
   // opens opportunities for globalopt (and inlining) by substituting function