Re-apply "Driver: Make profiling flags work with -nostdlib on Darwin"

This time without a stray "true" in an argument list.

This reverts r237077, restoring r237074.

llvm-svn: 237091
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 456bf77..d2865ec 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -239,6 +239,11 @@
                          bool IsEmbedded = false,
                          bool AddRPath = false) const;
 
+  /// Add any profiling runtime libraries that are needed. This is essentially a
+  /// MachO specific version of addProfileRT in Tools.cpp.
+  void addProfileRTLibs(const llvm::opt::ArgList &Args,
+                        llvm::opt::ArgStringList &CmdArgs) const;
+
   /// }
   /// @name ToolChain Implementation
   /// {