Make unique section names the default again.

Using non unique names found a bug in the ICF inplementation in gold:

https://sourceware.org/bugzilla/show_bug.cgi?id=18440

This reverts commit r234143.

llvm-svn: 238048
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 261af72..9b25cab 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3166,10 +3166,8 @@
       Args.hasArg(options::OPT_dA))
     CmdArgs.push_back("-masm-verbose");
 
-  bool UsingIntegratedAssembler =
-      Args.hasFlag(options::OPT_fintegrated_as, options::OPT_fno_integrated_as,
-                   IsIntegratedAssemblerDefault);
-  if (!UsingIntegratedAssembler)
+  if (!Args.hasFlag(options::OPT_fintegrated_as, options::OPT_fno_integrated_as,
+                    IsIntegratedAssemblerDefault))
     CmdArgs.push_back("-no-integrated-as");
 
   if (Args.hasArg(options::OPT_fdebug_pass_structure)) {
@@ -3412,8 +3410,7 @@
   }
 
   if (!Args.hasFlag(options::OPT_funique_section_names,
-                    options::OPT_fno_unique_section_names,
-                    !UsingIntegratedAssembler))
+                    options::OPT_fno_unique_section_names, true))
     CmdArgs.push_back("-fno-unique-section-names");
 
   Args.AddAllArgs(CmdArgs, options::OPT_finstrument_functions);