8253002: Remove the unused SafePointNode::_oop_map field

Reviewed-by: thartmann

Author: JornVernee

src/hotspot/share/opto/callnode.hpp

@@ -54,7 +54,6 @@ class     BoxLockNode;
 class     LockNode;
 class     UnlockNode;
 class JVMState;
-class OopMap;
 class State;
 class StartNode;
 class MachCallNode;
@@ -329,14 +328,12 @@ class SafePointNode : public MultiNode {
                 // A plain safepoint advertises no memory effects (NULL):
                 const TypePtr* adr_type = NULL)
     : MultiNode( edges ),
-      _oop_map(NULL),
       _jvms(jvms),
       _adr_type(adr_type)
   {
     init_class_id(Class_SafePoint);
   }
 
-  OopMap*         _oop_map;   // Array of OopMap info (8-bit char) for GC
   JVMState* const _jvms;      // Pointer to list of JVM State objects
   const TypePtr*  _adr_type;  // What type of memory does this node produce?
   ReplacedNodes   _replaced_nodes; // During parsing: list of pair of nodes from calls to GraphKit::replace_in_map()
@@ -349,8 +346,6 @@ class SafePointNode : public MultiNode {
   void set_jvms(JVMState* s) {
     *(JVMState**)&_jvms = s;  // override const attribute in the accessor
   }
-  OopMap *oop_map() const { return _oop_map; }
-  void set_oop_map(OopMap *om) { _oop_map = om; }
 
  private:
   void verify_input(JVMState* jvms, uint idx) const {

src/hotspot/share/opto/matcher.cpp

@@ -1346,9 +1346,6 @@ MachNode *Matcher::match_sfpt( SafePointNode *sfpt ) {
   assert((mcall == NULL) || (mcall->jvms() == NULL) ||
          (mcall->jvms()->debug_start() + mcall->_jvmadj == mcall->tf()->domain()->cnt()), "");
 
-  // Move the OopMap
-  msfpt->_oop_map = sfpt->_oop_map;
-
   // Add additional edges.
   if (msfpt->mach_constant_base_node_input() != (uint)-1 && !msfpt->is_MachCallLeaf()) {
     // For these calls we can not add MachConstantBase in expand(), as the