Don't internalize all but main by default.

This is mostly a cleanup, but it changes a fairly old behavior.

Every "real" LTO user was already disabling the silly internalize pass
and creating the internalize pass itself. The difference with this
patch is for "opt -std-link-opts" and the C api.

Now to get a usable behavior out of opt one doesn't need the funny
looking command line:

opt -internalize -disable-internalize -internalize-public-api-list=foo,bar -std-link-opts

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214919 91177308-0d34-0410-b5e6-96231b3b80d8

lib/LTO/LTOCodeGenerator.cpp

@@ -475,10 +475,8 @@ bool LTOCodeGenerator::generateObjectFile(raw_ostream &out,
   // keeps only main if it exists and does nothing for libraries. Instead
   // we create the pass ourselves with the symbol list provided by the linker.
   if (!DisableOpt)
-    PassManagerBuilder().populateLTOPassManager(passes,
-                                              /*Internalize=*/false,
-                                              !DisableInline,
-                                              DisableGVNLoadPRE);
+    PassManagerBuilder().populateLTOPassManager(passes, !DisableInline,
+                                                DisableGVNLoadPRE);
 
   // Make sure everything is still good.
   passes.add(createVerifierPass());