Rename clang::driver::tools::linuxtools to clang::driver::tools::gnutools.

This is about the GNU Binutils' assembler and linker, so reflect that in the
name.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178272 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.h b/lib/Driver/Tools.h
index 846c834..0d215ea 100644
--- a/lib/Driver/Tools.h
+++ b/lib/Driver/Tools.h
@@ -427,12 +427,11 @@
   };
 } // end namespace netbsd
 
-  /// linux -- Directly call GNU Binutils assembler and linker
-namespace linuxtools {
+  /// Directly call GNU Binutils' assembler and linker.
+namespace gnutools {
   class LLVM_LIBRARY_VISIBILITY Assemble : public Tool  {
   public:
-    Assemble(const ToolChain &TC) : Tool("linux::Assemble", "assembler",
-                                         TC) {}
+    Assemble(const ToolChain &TC) : Tool("GNU::Assemble", "assembler", TC) {}
 
     virtual bool hasIntegratedCPP() const { return false; }
 
@@ -444,7 +443,7 @@
   };
   class LLVM_LIBRARY_VISIBILITY Link : public Tool  {
   public:
-    Link(const ToolChain &TC) : Tool("linux::Link", "linker", TC) {}
+    Link(const ToolChain &TC) : Tool("GNU::Link", "linker", TC) {}
 
     virtual bool hasIntegratedCPP() const { return false; }
     virtual bool isLinkJob() const { return true; }