Release AST nodes after visiting array elements

[hsbt]

Fixes #9368

[hsbt]

@mhashizume Could you try this patch with your environment? Unfortunately, I don't have 32bit platform.

[Copilot]

Pull request overview

This PR addresses RubyGems SafeMarshal memory pressure during large array conversions by ensuring AST array elements are eligible for GC as they’re consumed, targeting the memory exhaustion reported in #9368.

Changes:

• Clear each visited Elements::Array entry (elements[idx] = nil) after converting it to a Ruby object to release AST nodes earlier.

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[mhashizume]

@mhashizume Could you try this patch with your environment? Unfortunately, I don't have 32bit platform.

I'm still seeing the same behavior with this patch applied

[hsbt]

@mhashizume Thanks. I don't have target platform so it's just guesswork, but I'll think about it.