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Add TCMALLOC_DEFER_PER_CPU_CACHES escape hatch and test variant. - #1287

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Add TCMALLOC_DEFER_PER_CPU_CACHES escape hatch and test variant.

Allow opting out of early per-CPU cache activation via the
TCMALLOC_DEFER_PER_CPU_CACHES environment variable, queried during
Static::SlowInitIfNecessary, and add the defer_per_cpu_caches test variant.

Allow opting out of early per-CPU cache activation via the
TCMALLOC_DEFER_PER_CPU_CACHES environment variable, queried during
Static::SlowInitIfNecessary, and add the defer_per_cpu_caches test variant.
PiperOrigin-RevId: 993486850
@copybara-service copybara-service Bot closed this Oct 6, 2026
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copybara-service Bot deleted the test_993486850 branch October 6, 2026 19:30
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