Get rid of unnecessary namespace prototype.

--HG--
extra : convert_revision : 388c0d6f2af96c4d33c1fe5d42a21866a4d71556

src/arch/x86/isa/includes.isa

@@ -108,8 +108,6 @@ output header {{
 
 output decoder {{
 
-namespace X86Macroop {
-};
 #include "base/cprintf.hh"
 #include "base/loader/symtab.hh"
 #include "cpu/thread_context.hh"  // for Jump::branchTarget()