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When ENABLE_BASELINE is set for x64 builds, Bun is compiled with -march=nehalem (no AVX/AVX2), but the prebuilt WebKit was downloaded without a -baseline suffix, linking against a WebKit compiled with AVX/AVX2 support. This caused SIGILL crashes on CPUs without AVX. Add -baseline suffix to the WebKit download URL when ENABLE_BASELINE is true for amd64 targets, matching the baseline artifact names from oven-sh/WebKit PR #137. Also remove unused WEBKIT_PREVIEW_PR variable (PR #140 was merged). Closes #27006 Co-Authored-By: Claude <noreply@anthropic.com>