[Mlir-commits] [mlir] Add a tutorial on mlir-opt (PR #96105)

[Mehdi Amini]

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+# Using `mlir-opt`
+
+`mlir-opt` is a command-line entry point for running passes and lowerings on MLIR code.
+This tutorial will explain how to use `mlir-opt`, show some examples of its usage,
+and mention some useful tips for working with it.
+
+Prerequisites:
+
+- [Building MLIR from source](/getting_started/)
+- [MLIR Language Reference](/docs/LangRef/)
+
+[TOC]
+
+## `mlir-opt` basics
+
+The `mlir-opt` tool loads a textual IR or bytecode into an in-memory structure,
+and optionally executes a sequence of passes
+before serializing back the IR (textual form by default).
+It is intended as a testing and debugging utility.
+
+After building the MLIR project,
+the `mlir-opt` binary (located in `build/bin`)
+is the entry point for running passes and lowerings,
+as well as emitting debug and diagnostic data.
+
+Running `mlir-opt` with no flags will consume textual or bytecode IR
+from standard in, parse and run verifiers on it,
----------------
joker-eph wrote:

```suggestion
from the standard input, parse and run verifiers on it,
```

https://github.com/llvm/llvm-project/pull/96105