Make WebAssembly SpillPointers pass opt-in to fix check-llvm regressions#6

Draft

Copilot wants to merge 6 commits intorelease/16.xfrom

copilot/fix-failed-llvm-tests

Commits on Mar 1, 2026

Initial plan
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Make WebAssemblySpillPointers pass opt-in via -wasm-enable-spill-pointers flag

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Revert opt-in flag approach; prepare to fix SpillPointers liveness bug

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PLUTOFX
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Fix SpillPointers liveness check and pointer classification

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Update tests for SpillPointers pass and fix unused variable warning

Copilot
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PLUTOFX
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Make SpillPointers pass opt-in via -wasm-enable-spill-pointers flag and revert test changes

Copilot
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PLUTOFX
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