node.h: Reduce struct size to fit with Ruby object size (five VALUEs)

by merging `rb_ast_body_t#line_count` and `#script_lines`.

Fortunately `line_count == RARRAY_LEN(script_lines)` was always
satisfied. When script_lines is saved, it has an array of lines, and
when not saved, it has a Fixnum that represents the old line_count.

1 files changed, 3 insertions, 1 deletions

diff --git a/node.h b/node.h
index 592b285b83..8b09e81a8c 100644
--- a/node.h
+++ b/node.h
@@ -398,8 +398,10 @@ typedef struct node_buffer_struct node_buffer_t;
 typedef struct rb_ast_body_struct {
     const NODE *root;
     VALUE compile_option;
-    int line_count;
     VALUE script_lines;
+    // script_lines is either:
+    // - a Fixnum that represents the line count of the original source, or
+    // - an Array that contains the lines of the original source
 } rb_ast_body_t;
 typedef struct rb_ast_struct {
     VALUE flags;