Remove unused param from Linux::computeSysRoot().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192034 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.h b/lib/Driver/ToolChains.h
index 12121bf..52cc456 100644
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -591,7 +591,7 @@
                                        const llvm::opt::ArgList &DriverArgs,
                                        llvm::opt::ArgStringList &CC1Args);
 
-  std::string computeSysRoot(const llvm::opt::ArgList &Args) const;
+  std::string computeSysRoot() const;
 };
 
 class LLVM_LIBRARY_VISIBILITY Hexagon_TC : public Linux {