Remove SystemAllocateMemory's hidden 4-byte tag-header scheme.

The HEAP/MMAP tag word written just before every allocated pointer (to
let SystemFreeMemory dispatch to free() vs munmap()) unconditionally
shifted every allocation 4 bytes off whatever alignment malloc actually
provided. The mmap path was permanently dead code (if (0), condition
commented out) -- malloc is the only allocator ever used -- so the tag
was pure overhead with no benefit, and it was silently defeating
g_pHashTable's deliberate 4-entries-per-cache-line (16 bytes x 4 = 64
bytes) layout: verified via lldb that the table was consistently
offset by exactly 4 bytes from a 64-byte boundary before this change,
and is now consistently 64-byte aligned across multiple runs.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01C9r36BydPnfpyYLFhkTo6d

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