[Enh] Support chained comparison

[sjfeng1999]

Motivation

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

Adds frontend support for Python chained comparisons (e.g. a < b < c) by lowering them into boolean operations that FlyDSL can already rewrite/lower, and adds unit coverage for both dynamic IR tracing and constexpr evaluation.

Changes:

• Add RewriteBoolOps.visit_Compare lowering of chained ast.Compare into BoolOp(And) to reuse existing and lowering.
• Rename boolean hook dunders from __fly_*__ to __dsl_*__ in both the AST rewriter and Numeric.
• Add unit tests covering dynamic chained-compare lowering and constexpr chained-compare acceptance.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
tests/unit/test_if_dispatch_paths.py	Adds a dynamic chained-compare test that verifies IR contains multiple cmpi and an andi.
tests/unit/test_constexpr.py	Adds a constexpr chained-compare JIT test.
python/flydsl/expr/numeric.py	Renames boolean hook dunders to __dsl_*__.
python/flydsl/compiler/ast_rewriter.py	Adds chained-compare rewrite and updates bool-op hook dispatch to __dsl_*__.

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