8005811: Turn off TierdCompilation in JDK8 trunk for all platforms

Summary: Disable tiered compilation in jdk8 because of CodeCache and performance anomalies
Reviewed-by: kvn, twisti

src/cpu/sparc/vm/c2_globals_sparc.hpp

@@ -42,7 +42,7 @@ define_pd_global(bool, ProfileInterpreter,           false);
 #else
 define_pd_global(bool, ProfileInterpreter,           true);
 #endif // CC_INTERP
-define_pd_global(bool, TieredCompilation,            trueInTiered);
+define_pd_global(bool, TieredCompilation,            false);
 define_pd_global(intx, CompileThreshold,             10000);
 define_pd_global(intx, BackEdgeThreshold,            140000);
 

src/cpu/x86/vm/c2_globals_x86.hpp

@@ -44,7 +44,7 @@ define_pd_global(bool, ProfileInterpreter,           false);
 #else
 define_pd_global(bool, ProfileInterpreter,           true);
 #endif // CC_INTERP
-define_pd_global(bool, TieredCompilation,            trueInTiered);
+define_pd_global(bool, TieredCompilation,            false);
 define_pd_global(intx, CompileThreshold,             10000);
 define_pd_global(intx, BackEdgeThreshold,            100000);