Ruby

[DOC] Add missing opts argument to IO.binwrite

[DOC] for IO.write (#16857)

[DOC] Doc for Pathname#write

[DOC] Add Japanese and data to IO.read

Refactor setivar caches to include the source and destination shapes

This is how caches used to work prior to 913979bede2a1b79109fa2072352882560d55fe0,
however since inline cache need to be set atomically, they are
limited to 64bits, which wasn't enough to store an attr_index_t...

Reduce INVALID_SHAPE_ID to only its offset

Given we only store the shape offset in ivar caches, and the
offset is only 19bits, we should be able to store two shape offsets
and an attribute index in a single uint64_t.

Which is perfect for setivar caches....

shape.c: rename shape_id and shape_offset helpers

These are natural variable names, so by using macro like
case we avoid name conflicts.

shape.c: finalize the "offset" rename

To better distinguish fully formed shape ids from "naked" offsets.

vm_callinfo.h: stop uselessly incrementing attr_index

There might have been a reason for this, but it's likely long gone.

gc: Simplify updating the shape after move

Back when this code was added, moving a T_OBJECT to a different
size pool required to rebuilt its shape tree, which could allocate,
potentially triggering GC during GC.

Ref: https://github.com/ruby/ruby/pull/6926...