Runtime performance optimizations + Apple Silicon FFI-callback W^X fix#1771

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dg1sbg wants to merge 7 commits into

clasp-developers:mainfrom

dg1sbg:perf/runtime-optimizations

Commits on Jun 2, 2026

Default *print-pretty* to NIL (matching SBCL/CCL/CLISP)

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claude
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Make per-thread allocation counters non-atomic

dg1sbg
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claude
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Add a bulk StringOutputStream_O::write_string override

dg1sbg
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claude
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Make countObjectFileNames O(1) instead of O(N) per registration

dg1sbg
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claude
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Enable Boehm parallel marking (PARALLEL_MARK)

dg1sbg
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Cache the thread-local pointer in the bytecode VM

dg1sbg
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Fix Apple Silicon W^X SIGBUS when creating FFI callbacks

dg1sbg
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claude
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