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/IPO.cpp b/lib/Transforms/IPO/IPO.cpp
index 86c76f0..5d563d8 100644
--- a/lib/Transforms/IPO/IPO.cpp
+++ b/lib/Transforms/IPO/IPO.cpp
@@ -95,7 +95,10 @@
 }
 
 void LLVMAddInternalizePass(LLVMPassManagerRef PM, unsigned AllButMain) {
-  unwrap(PM)->add(createInternalizePass(AllButMain != 0));
+  std::vector<const char *> Export;
+  if (AllButMain)
+    Export.push_back("main");
+  unwrap(PM)->add(createInternalizePass(Export));
 }
 
 void LLVMAddStripDeadPrototypesPass(LLVMPassManagerRef PM) {