[BugFix] Remove unnecessary binding in loop variable analysis and add test for issue 1728

[kurisu6912]

see #1728

Summary by CodeRabbit

• Refactor
  • Improved internal loop variable analysis in the simplification transformation logic.

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📝 Walkthrough

Walkthrough

A single line removing the analyzer binding of the loop variable to its min/extent range in the ForNode visitor of the simplification pass. The constraint contexts for loop bounds remain intact.

Changes

Cohort / File(s)	Summary
Loop Variable Binding Removal src/transform/simplify.cc	Removed analyzer binding of loop variable to Range::FromMinExtent(op->min, op->extent) in ForNode visitor; constraint contexts for bounds remain

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• [Fix] Fix analyzer bind conflicting bug in #1442 #1446: Addresses analyzer binding conflicts for For nodes through different mechanisms (analyzer save/restore and loop-handling in layout_inference.cc).

Poem

🐰 A binding unbind, so curious and light,
The loop variable freed from its Range-y plight,
Constraints still stand, holding bounds so tight,
Simplifications bloom with fresh insight!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: removing an unnecessary binding in loop variable analysis and adding a test for issue 1728, which aligns with the code changes shown in the raw summary.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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