Enabled SIMDJSON for Machines Without AVX2 But with SSE 4.2 and PCLMUL Instruction Set

Why it matters

This feature expands SIMDJSON compatibility to a wider range of CPUs that do not support AVX2 instructions but have SSE 4.2 and PCLMUL. It improves JSON parsing performance on these machines by leveraging available SIMD instructions, enabling faster data processing in ClickHouse.

How to use it

No explicit user action is required; ClickHouse will automatically utilize SIMDJSON accelerated parsing on supported CPUs with SSE 4.2 and PCLMUL even if AVX2 is not available.