8284584: Avoid duplicate node_idx_t definitions

Reviewed-by: kvn, redestad

src/hotspot/share/opto/compile.hpp

@@ -103,7 +103,12 @@ enum LoopOptsMode {
   LoopOptsVerify
 };
 
+// The type of all node counts and indexes.
+// It must hold at least 16 bits, but must also be fast to load and store.
+// This type, if less than 32 bits, could limit the number of possible nodes.
+// (To make this type platform-specific, move to globalDefinitions_xxx.hpp.)
 typedef unsigned int node_idx_t;
+
 class NodeCloneInfo {
  private:
   uint64_t _idx_clone_orig;

src/hotspot/share/opto/node.hpp

@@ -177,12 +177,6 @@ class VectorSet;
 class VectorReinterpretNode;
 class ShiftVNode;
 
-// The type of all node counts and indexes.
-// It must hold at least 16 bits, but must also be fast to load and store.
-// This type, if less than 32 bits, could limit the number of possible nodes.
-// (To make this type platform-specific, move to globalDefinitions_xxx.hpp.)
-typedef unsigned int node_idx_t;
-
 
 #ifndef OPTO_DU_ITERATOR_ASSERT
 #ifdef ASSERT