src/share/vm/opto/chaitin.cpp

rev 5829 : 8032656: Tag the MachSpillCopies with purpose information
Summary: Subclassed the MachSpillCopyNode with different subnodes for different spill purposes to enhance debugging / visualization
Reviewed-by:

*** 1797,1807 ****
          Node *phi = n->in(1);
          if( phi->is_Phi() && phi->as_Phi()->region()->is_Loop() ) {
            Block *phi_block = _cfg.get_block_for_node(phi);
            if (_cfg.get_block_for_node(phi_block->pred(2)) == block) {
              const RegMask *mask = C->matcher()->idealreg2spillmask[Op_RegI];
!             Node *spill = new (C) MachSpillCopyNode( phi, *mask, *mask );
              insert_proj( phi_block, 1, spill, maxlrg++ );
              n->set_req(1,spill);
              must_recompute_live = true;
            }
          }
--- 1797,1807 ----
          Node *phi = n->in(1);
          if( phi->is_Phi() && phi->as_Phi()->region()->is_Loop() ) {
            Block *phi_block = _cfg.get_block_for_node(phi);
            if (_cfg.get_block_for_node(phi_block->pred(2)) == block) {
              const RegMask *mask = C->matcher()->idealreg2spillmask[Op_RegI];
!             Node *spill = new (C) MachSpillCopyNode(MachSpillCopyNode::LoopPhiInput, phi, *mask, *mask);
              insert_proj( phi_block, 1, spill, maxlrg++ );
              n->set_req(1,spill);
              must_recompute_live = true;
            }
          }