Get rid of ast node ids.

runtime/vm/code_descriptors.h

Index: runtime/vm/code_descriptors.h
===================================================================
--- runtime/vm/code_descriptors.h	(revision 10302)
+++ runtime/vm/code_descriptors.h	(working copy)
@@ -16,7 +16,7 @@
   struct PcDesc {
     intptr_t pc_offset;        // PC offset value of the descriptor.
     PcDescriptors::Kind kind;  // Descriptor kind (kDeopt, kOther).
-    intptr_t node_id;          // AST node id.
+    intptr_t deopt_id;         // Deoptimization id.
     intptr_t token_index;      // Token position in source of PC.
     intptr_t try_index;        // Try block index of PC or deopt array index.
   };
@@ -35,10 +35,10 @@
   PcDescriptors::Kind Kind(int index) const {
     return list_[index].kind;
   }
-  intptr_t NodeId(int index) const {
-    return list_[index].node_id;
+  intptr_t DeoptId(int index) const {
+    return list_[index].deopt_id;
   }
-  intptr_t TokenIndex(int index) const {
+  intptr_t TokenPos(int index) const {
     return list_[index].token_index;
   }
   intptr_t TryIndex(int index) const {
@@ -47,11 +47,11 @@
 
   void AddDescriptor(PcDescriptors::Kind kind,
                      intptr_t pc_offset,
-                     intptr_t node_id,
+                     intptr_t deopt_id,
                      intptr_t token_index,
                      intptr_t try_index);
   void AddDeoptInfo(intptr_t pc_offset,
-                    intptr_t node_id,
+                    intptr_t deopt_id,
                     intptr_t token_index,
                     intptr_t deopt_array_index);