Move IO#readline to Ruby

This commit moves IO#readline to Ruby.  In order to call C functions,
keyword arguments must be converted to hashes.  Prior to this commit,
code like `io.readline(chomp: true)` would allocate a hash.  This
commits moves the keyword "denaturing" to Ruby, allowing us to send
positional arguments to the C API and avoiding the hash allocation.

Here is an allocation benchmark for the method:

```
x = GC.stat(:total_allocated_objects)
File.open("/usr/share/dict/words") do |f|
  f.readline(chomp: true) until f.eof?
end
p ALLOCATIONS: GC.stat(:total_allocated_objects) - x
```

Before this commit, the output was this:

```
$ make run
./miniruby -I./lib -I. -I.ext/common  -r./arm64-darwin22-fake  ./test.rb
{:ALLOCATIONS=>707939}
```

Now it is this:

```
$ make run
./miniruby -I./lib -I. -I.ext/common  -r./arm64-darwin22-fake  ./test.rb
{:ALLOCATIONS=>471962}
```

[Bug #19890] [ruby-core:114803]

1 files changed, 2 insertions, 0 deletions

diff --git a/internal/vm.h b/internal/vm.h
index 571cf73c52..d10c14eb4d 100644
--- a/internal/vm.h
+++ b/internal/vm.h
@@ -58,6 +58,8 @@ VALUE rb_yield_refine_block(VALUE refinement, VALUE refinements);
 VALUE ruby_vm_special_exception_copy(VALUE);
 PUREFUNC(st_table *rb_vm_fstring_table(void));
 
+void rb_lastline_set_up(VALUE val, unsigned int up);
+
 /* vm_eval.c */
 VALUE rb_current_realfilepath(void);
 VALUE rb_check_block_call(VALUE, ID, int, const VALUE *, rb_block_call_func_t, VALUE);