8253029: [PPC64] Remove obsolete Power6 code

Reviewed-by: dholmes, lucy

Author: TheRealMDoerr

src/hotspot/cpu/ppc/c2_init_ppc.cpp

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
+ * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2020 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -40,12 +40,6 @@ void Compile::pd_compiler2_init() {
     }
   }
 
-  if (PowerArchitecturePPC64 == 6) {
-    if (FLAG_IS_DEFAULT(InsertEndGroupPPC64)) {
-      FLAG_SET_ERGO(InsertEndGroupPPC64, true);
-    }
-  }
-
   if (!VM_Version::has_isel() && FLAG_IS_DEFAULT(ConditionalMoveLimit)) {
     FLAG_SET_ERGO(ConditionalMoveLimit, 0);
   }

src/hotspot/cpu/ppc/globals_ppc.hpp

@@ -134,12 +134,6 @@ define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
   product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false,      \
           "Use static branch prediction hints for uncommon paths.")         \
                                                                             \
-  product(bool, UsePower6SchedulerPPC64, false,                             \
-          "Use Power6 Scheduler.")                                          \
-                                                                            \
-  product(bool, InsertEndGroupPPC64, false,                                 \
-          "Insert EndGroup instructions to optimize for Power6.")           \
-                                                                            \
   /* Trap based checks. */                                                  \
   /* Trap based checks use the ppc trap instructions to check certain */    \
   /* conditions. This instruction raises a SIGTRAP caught by the      */    \