Enabling new pass manager in LTO (and thinLTO) link step.

Passes 'new-pass-manager' option to the linker plugin when the new pass
manager is enabled.

Patch by Graham Yiu.

Differential Revision: https://reviews.llvm.org/D38517

llvm-svn: 314964
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index d052bb2..4020059 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -454,6 +454,14 @@
       CmdArgs.push_back(
           Args.MakeArgString(Twine("-plugin-opt=sample-profile=") + FName));
   }
+
+  // Need this flag to turn on new pass manager via Gold plugin.
+  if (Args.hasFlag(options::OPT_fexperimental_new_pass_manager,
+                   options::OPT_fno_experimental_new_pass_manager,
+                   /* Default */ false)) {
+    CmdArgs.push_back("-plugin-opt=new-pass-manager");
+  }
+
 }
 
 void tools::addArchSpecificRPath(const ToolChain &TC, const ArgList &Args,