Rename the successor field of instruction to next.

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index febaccc0a92dbd62cfe9488d2e0812db05b8d5a1..329204c6f984e1b1f8cdaf5cc49e370d5c54bb5d 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -95,14 +95,14 @@ void FlowGraphCompiler::VisitBlocks() {
     // Compile the block entry.
     set_current_block(block_order()[i]);
     current_block()->PrepareEntry(this);
-    Instruction* instr = current_block()->successor();
+    Instruction* instr = current_block()->next();
     // Compile all successors until an exit, branch, or a block entry.
     while ((instr != NULL) && !instr->IsBlockEntry()) {
       if (FLAG_code_comments) EmitComment(instr);
       ASSERT(instr->locs() != NULL);
       EmitInstructionPrologue(instr);
       instr->EmitNativeCode(this);
-      instr = instr->successor();
+      instr = instr->next();
     }
     BlockEntryInstr* successor =
         (instr == NULL) ? NULL : instr->AsBlockEntry();