8008938: TieredCompilation should be default

Switch on TieredCompilation by default

Reviewed-by: twisti
diff --git a/hotspot/src/cpu/sparc/vm/c2_globals_sparc.hpp b/hotspot/src/cpu/sparc/vm/c2_globals_sparc.hpp
index e32094d..093be80 100644
--- a/hotspot/src/cpu/sparc/vm/c2_globals_sparc.hpp
+++ b/hotspot/src/cpu/sparc/vm/c2_globals_sparc.hpp
@@ -42,7 +42,7 @@
 #else
 define_pd_global(bool, ProfileInterpreter,           true);
 #endif // CC_INTERP
-define_pd_global(bool, TieredCompilation,            false);
+define_pd_global(bool, TieredCompilation,            trueInTiered);
 define_pd_global(intx, CompileThreshold,             10000);
 define_pd_global(intx, BackEdgeThreshold,            140000);
 
diff --git a/hotspot/src/cpu/x86/vm/c2_globals_x86.hpp b/hotspot/src/cpu/x86/vm/c2_globals_x86.hpp
index ce92123..d49bec2 100644
--- a/hotspot/src/cpu/x86/vm/c2_globals_x86.hpp
+++ b/hotspot/src/cpu/x86/vm/c2_globals_x86.hpp
@@ -44,7 +44,7 @@
 #else
 define_pd_global(bool, ProfileInterpreter,           true);
 #endif // CC_INTERP
-define_pd_global(bool, TieredCompilation,            false);
+define_pd_global(bool, TieredCompilation,            trueInTiered);
 define_pd_global(intx, CompileThreshold,             10000);
 define_pd_global(intx, BackEdgeThreshold,            100000);