Fix ScopeInfo::StackSlotIndex to skip over non-locals

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 715076640c0968ccc1f8821e675d5e695d5188a7..1dcb35167d60ef0f6316777279b1828ecca1170a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4000,9 +4000,9 @@ class ScopeInfo : public FixedArray {
 
   // Lookup support for serialized scope info. Returns the
   // the stack slot index for a given slot name if the slot is
-  // present; otherwise returns a value < 0. The name must be an internalized
-  // string.
-  int StackSlotIndex(String* name);
+  // allocated to a local; otherwise returns a value < 0.
+  // The name must be an internalized string.
+  int StackLocalSlotIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the
   // context slot index for a given slot name if the slot is present; otherwise