Some minor cleanups.

src/cpu/SConscript:
    Change the error message to be slightly nicer.
src/cpu/o3/commit.hh:
    Remove old code.
src/cpu/o3/commit_impl.hh:
    Remove old unused code.

--HG--
extra : convert_revision : 48aa430e1f3554007dd5e4f3d9e89b5e4f124390

src/cpu/SConscript

@@ -188,9 +188,10 @@ if env['USE_CHECKER']:
         if i in env['CPU_MODELS']:
             checker_supports = True
     if not checker_supports:
-        print "Checker only supports CPU models %s, please " \
-              "set USE_CHECKER=False or use one of those CPU models" \
-              % CheckerSupportedCPUList
+        print "Checker only supports CPU models",
+        for i in CheckerSupportedCPUList:
+            print i,
+        print ", please set USE_CHECKER=False or use one of those CPU models"              
         Exit(1)