Mark frame info structs with rb_gc_mark_movable

Using rb_gc_mark_movable and a reference update function, we can make
frame infos movable in memory, and avoid pinning frame info backtraces.

```
require "objspace"
exceptions = []
GC.disable
50_000.times do
  begin
    raise "some exception"
  rescue => exception
    exception.backtrace_locations
    exceptions << exception
  end
end
GC.enable
GC.compact
p ObjectSpace.dump_all(output: :string).lines.grep(/"pinned":true/).count
```

Co-authored-by: Peter Zhu <peter@peterzhu.ca>

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