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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@238048 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/Tools.cpp

@@ -3166,10 +3166,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       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 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   }
 
   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);

test/Driver/function-sections.c

@@ -72,13 +72,3 @@
 // RUN:     -target i386-unknown-linux \
 // RUN:     -fno-unique-section-names \
 // RUN:   | FileCheck --check-prefix=CHECK-NOUS %s
-
-// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1        \
-// RUN:     -target i386-unknown-linux \
-// RUN:     -fno-integrated-as \
-// RUN:   | FileCheck --check-prefix=CHECK-US %s
-
-// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1        \
-// RUN:     -target i386-unknown-linux \
-// RUN:     -fintegrated-as \
-// RUN:   | FileCheck --check-prefix=CHECK-NOUS %s