Revert "Implement register-based closure ctx"

[xushiwei]

Reverts #1599

[gemini-code-assist]

Note

The number of changes in this pull request is too large for Gemini Code Assist to generate a summary.

[xgopilot]

Code Review Summary

This revert of PR #1599 is clean and complete. The PR properly removes the register-based closure context passing and returns to the parameter-based approach. The documentation in doc/closure.md is accurate and well-written, clearly describing the explicit __llgo_ctx parameter convention.

No critical issues found. The code quality is good, and the changes are consistent throughout.

Minor Suggestions

Two potential improvements in the newly added runtime functions:

1. structequal - Consider adding a check to skip blank-named fields (_) for consistency with Go runtime semantics.

2. arrayequal - A pointer equality early-exit (if p == q { return true }) could optimize the self-comparison case.

These are minor optimizations and don't block the revert.

[xgopilot]

Consider adding a pointer equality fast path for the common case where the same array is compared to itself:

Suggested change

	func arrayequal(t, p, q unsafe.Pointer) bool {
	func arrayequal(t, p, q unsafe.Pointer) bool {
	if p == q {
	return true
	}
	x := (*arraytype)(t)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.06%. Comparing base (d3861ee) to head (1febf44).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1614      +/-   ##
==========================================
+ Coverage   90.51%   91.06%   +0.55%     
==========================================
  Files          48       45       -3     
  Lines       12077    11938     -139     
==========================================
- Hits        10931    10871      -60     
+ Misses        956      892      -64     
+ Partials      190      175      -15     

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