Combine sweeping and moving

This commit combines the sweep step with moving objects.  With this
commit, we can do:

```ruby
GC.start(compact: true)
```

This code will do the following 3 steps:

1. Fully mark the heap
2. Sweep + Move objects
3. Update references

By default, this will compact in order that heap pages are allocated.
In other words, objects will be packed towards older heap pages (as
opposed to heap pages with more pinned objects like `GC.compact` does).

1 files changed, 4 insertions, 4 deletions

diff --git a/gc.rb b/gc.rb
index dd5781b603..23ed12ffdc 100644
--- a/gc.rb
+++ b/gc.rb
@@ -30,12 +30,12 @@ module GC
   #  Note: These keyword arguments are implementation and version dependent. They
   #  are not guaranteed to be future-compatible, and may be ignored if the
   #  underlying implementation does not support them.
-  def self.start full_mark: true, immediate_mark: true, immediate_sweep: true
-    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep
+  def self.start full_mark: true, immediate_mark: true, immediate_sweep: true, compact: false
+    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep, compact
   end
 
   def garbage_collect full_mark: true, immediate_mark: true, immediate_sweep: true
-    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep
+    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep, false
   end
 
   #  call-seq:
@@ -188,7 +188,7 @@ end
 
 module ObjectSpace
   def garbage_collect full_mark: true, immediate_mark: true, immediate_sweep: true
-    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep
+    __builtin_gc_start_internal full_mark, immediate_mark, immediate_sweep, false
   end
 
   module_function :garbage_collect