Review and update `ryujit-tutorial.md`

[SingleAccretion]

While still largely accurate, the document contains some bits of outdated information, e. g.:

.NET is somewhat unique in that it currently has a single-tier JIT – no interpreter, and no re-optimizing JIT.
While an interpreter exists, and experimentation has been done on re-jitting, the current model remains single-tier.

And old-style dumps:

▌  Statement  (top level) (IL 0x01D
│        ┌──▌  const int 1
│     ┌──▌  & int
│     │  └──▌  lclVar int V08
│  ┌──▌  + int
│  │  └──▌  lclVar int V06
└──▌  = int
   └──▌  lclVar int V06

The accompanying ryu-jit-overview.md document should also be reviewed and updated.

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Issue Details

---

While still largely accurate, the document contain some bits of outdated information, e. g.:

.NET is somewhat unique in that it currently has a single-tier JIT – no interpreter, and no re-optimizing JIT.
While an interpreter exists, and experimentation has been done on re-jitting, the current model remains single-tier.

And old-style dumps:

▌  Statement  (top level) (IL 0x01D
│        ┌──▌  const int 1
│     ┌──▌  & int
│     │  └──▌  lclVar int V08
│  ┌──▌  + int
│  │  └──▌  lclVar int V06
└──▌  = int
   └──▌  lclVar int V06

The accompanying ryu-jit-overview.md document should also be reviewed and updated.

Author:	SingleAccretion
Assignees:	SingleAccretion
Labels:	area-CodeGen-coreclr
Milestone:	Future

[EgorBo]

Requires re-drawing diagrams 🙂