Reapply r9673 "Scope tree serialization and ScopeIterator cleanup."

src/v8globals.h

Index: src/v8globals.h
diff --git a/src/v8globals.h b/src/v8globals.h
index 2a0a266bcb04e93ba90d4a2726320d3e16b607b9..0601e8affb11714c969fc5e3961f8cf871053093 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -509,6 +509,16 @@ enum CallKind {
 };
 
 
+enum ScopeType {
+  EVAL_SCOPE,      // The top-level scope for an eval source.
+  FUNCTION_SCOPE,  // The top-level scope for a function.
+  GLOBAL_SCOPE,    // The top-level scope for a program or a top-level eval.
+  CATCH_SCOPE,     // The scope introduced by catch.
+  BLOCK_SCOPE,     // The scope introduced by a new block.
+  WITH_SCOPE       // The scope introduced by with.
+};
+
+
 static const uint32_t kHoleNanUpper32 = 0x7FFFFFFF;
 static const uint32_t kHoleNanLower32 = 0xFFFFFFFF;
 static const uint32_t kNaNOrInfinityLowerBoundUpper32 = 0x7FF00000;