cl compileFuncOrMethod: ignore if parent is ignored; ctx.varName support nsPrefix

[xushiwei]

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[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.04%. Comparing base (6e0abd0) to head (5d7de60).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cl/name.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #906      +/-   ##
==========================================
- Coverage   89.04%   89.04%   -0.01%     
==========================================
  Files          21       21              
  Lines        1972     1981       +9     
==========================================
+ Hits         1756     1764       +8     
- Misses        216      217       +1     

Flag	Coverage Δ
llgo-tests	89.04% <90.90%> (-0.01%)	⬇️

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[fennoai]

Review: cl compileFuncOrMethod — ignore if parent is ignored

Clean, well-targeted change that lets a function inherit the ignore state of its enclosing namespace/class, mirroring the existing loadTypedef pattern. The cNameOf(fn) → cNameWithNS(clang.String(fn), ns) refactor is equivalent for functions (a function cursor's spelling has no type tag, so trimTypeTag is a no-op) and nicely avoids walking the parent chain twice since ns is reused by the nsFeats check. Empty-namespace / C global functions are handled correctly (nsFeats("") returns 0), performance is neutral, and no security issues were found in the diff.

One consistency item inline. A couple of minor, discretionary notes below.

Minor / discretionary:

• cl/func.go:76 — message wording: "its parent is ignored, ignored too" is awkward, and ns is the full enclosing namespace chain (cNS joins all semantic parents with ::), not just the immediate parent. Something like "enclosing namespace ignored, so ignored too" would read better. Matches the existing typedef.go wording, so low priority.
• cl/func.go:54-60 — the doc comment still describes only the receiver semantics and doesn't mention the new "inherited ignore" path. Optional, since the other ignore branches in this function are likewise undocumented in the header.
• cl/name.go:82-95 (pre-existing, not in this diff) — cNS lacks the decl.IsNull() guard that cNameOf has (name.go:74), terminating only on Cursor_TranslationUnit. This PR routes function compilation through cNS, widening its exposure; worth mirroring the cNameOf guard for robustness against malformed cursor chains.