don't need to sweep rest.

`transient_heap_evacuate()` disables GC using `rb_gc_disable()`
to prohibt GC invocation because of new allocation for evacuated
memory. However, `rb_gc_disable()` sweep all rest of unswept pages.
We don't need to cancel lazy sweep so this patch introduce
`rb_gc_disable_no_rest()` which doesn't cancel lazy sweep.

1 files changed, 2 insertions, 0 deletions

diff --git a/gc.h b/gc.h
index 727890181a..f3b433f0c4 100644
--- a/gc.h
+++ b/gc.h
@@ -94,6 +94,8 @@ const char *rb_obj_info(VALUE obj);
 const char *rb_raw_obj_info(char *buff, const int buff_size, VALUE obj);
 void rb_obj_info_dump(VALUE obj);
 
+VALUE rb_gc_disable_no_rest(void);
+
 struct rb_thread_struct;
 
 RUBY_SYMBOL_EXPORT_BEGIN