gcc: Clean-up of non-C++0x compliant code, first steps

This patch cleans up a number of minor issues aiming to get closer to
compliance with the C++0x standard as interpreted by gcc and clang
(compile with std=c++0x and -pedantic-errors). In particular, the
patch cleans up enums where the last item was succeded by a comma,
namespaces closed by a curcly brace followed by a semi-colon, and the
use of the GNU-extension typeof (replaced by templated functions). It
does not address variable-length arrays, zero-size arrays, anonymous
structs, range expressions in switch statements, and the use of long
long. The generated CPU code also has a large number of issues that
remain to be fixed, mainly related to overflows in implicit constant
conversion (due to shifts).

src/cpu/o3/dyn_inst.hh

@@ -81,7 +81,7 @@ class BaseO3DynInst : public BaseDynInst<Impl>
 
     enum {
         MaxInstSrcRegs = TheISA::MaxInstSrcRegs,        //< Max source regs
-        MaxInstDestRegs = TheISA::MaxInstDestRegs,      //< Max dest regs
+        MaxInstDestRegs = TheISA::MaxInstDestRegs       //< Max dest regs
     };
 
   public:

src/cpu/o3/thread_context.hh

@@ -50,7 +50,7 @@
 class EndQuiesceEvent;
 namespace Kernel {
     class Statistics;
-};
+}
 
 /**
  * Derived ThreadContext class for use with the O3CPU.  It