gem5: codebase patched to compile with ag++

This changes allows us to compile the gem5 simulator with ag++. It
was tested with ag++ v0.8, built Apr 18 2013. Most of the changes
are preprocessor directives like #ifndef __puma which have been
inserted into the gem5 code. Unfortunately, a python script and a
SWIG input file have been patched, too.
Additionally, the CMake file has been updated. A single call to
"make" now invokes the ag++ (instead of the g++) compiler front
end. The new CMake target "gem5-allclean" should be used to clean
the current project when building FailGem5. In addition to cleaning
the Fail build directory, it also invokes "scons -c" in the gem5
build directory; that is, gem5 is cleaned as well.

Change-Id: I20a92f025f34f626b81e30f2c873baeba189f83b

simulators/gem5/src/base/random.hh

@@ -69,6 +69,7 @@ class Random
         value = genrand() & (int8_t)-1;
     }
 
+#ifndef __puma // DanceOS (redefinition of `_random')
     void
     _random(int16_t &value)
     {
@@ -86,6 +87,7 @@ class Random
     {
         value = (int64_t)genrand() << 32 | (int64_t)genrand();
     }
+#endif // DanceOS
 
     void
     _random(uint8_t &value)
@@ -136,6 +138,7 @@ class Random
         return static_cast<int8_t>(min + genrand(diff));
     }
 
+#ifndef __puma // DanceOS (redefinition of `_random')
     int16_t
     _random(int16_t min, int16_t max)
     {
@@ -156,6 +159,7 @@ class Random
         uint64_t diff = max - min;
         return static_cast<int64_t>(min + genrand(diff));
     }
+#endif // DanceOS
 
     uint8_t
     _random(uint8_t min, uint8_t max)