Replaced SDL_SIMDAlloc(), SDL_SIMDRealloc(), and SDL_SIMDFree() with SDL_aligned_alloc() and SDL_aligned_free()

Fixes https://github.com/libsdl-org/SDL/issues/5641

include/SDL3/SDL_cpuinfo.h

@@ -367,96 +367,12 @@ extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
  *          instructions.
  *
  * \since This function is available since SDL 3.0.0.
+ *
+ * \sa SDL_aligned_alloc
+ * \sa SDL_aligned_free
  */
 extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
 
-/**
- * Allocate memory in a SIMD-friendly way.
- *
- * This will allocate a block of memory that is suitable for use with SIMD
- * instructions. Specifically, it will be properly aligned and padded for the
- * system's supported vector instructions.
- *
- * The memory returned will be padded such that it is safe to read or write an
- * incomplete vector at the end of the memory block. This can be useful so you
- * don't have to drop back to a scalar fallback at the end of your SIMD
- * processing loop to deal with the final elements without overflowing the
- * allocated buffer.
- *
- * You must free this memory with SDL_FreeSIMD(), not free() or SDL_free() or
- * delete[], etc.
- *
- * Note that SDL will only deal with SIMD instruction sets it is aware of; for
- * example, SDL 2.0.8 knows that SSE wants 16-byte vectors (SDL_HasSSE()), and
- * AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't know that AVX-512 wants
- * 64. To be clear: if you can't decide to use an instruction set with an
- * SDL_Has*() function, don't use that instruction set with memory allocated
- * through here.
- *
- * SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't
- * out of memory, but you are not allowed to dereference it (because you only
- * own zero bytes of that buffer).
- *
- * \param len The length, in bytes, of the block to allocate. The actual
- *            allocated block might be larger due to padding, etc.
- * \returns a pointer to the newly-allocated block, NULL if out of memory.
- *
- * \since This function is available since SDL 3.0.0.
- *
- * \sa SDL_SIMDGetAlignment
- * \sa SDL_SIMDRealloc
- * \sa SDL_SIMDFree
- */
-extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
-
-/**
- * Reallocate memory obtained from SDL_SIMDAlloc
- *
- * It is not valid to use this function on a pointer from anything but
- * SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
- * SDL_malloc, memalign, new[], etc.
- *
- * \param mem The pointer obtained from SDL_SIMDAlloc. This function also
- *            accepts NULL, at which point this function is the same as
- *            calling SDL_SIMDAlloc with a NULL pointer.
- * \param len The length, in bytes, of the block to allocated. The actual
- *            allocated block might be larger due to padding, etc. Passing 0
- *            will return a non-NULL pointer, assuming the system isn't out of
- *            memory.
- * \returns a pointer to the newly-reallocated block, NULL if out of memory.
- *
- * \since This function is available since SDL 3.0.0.
- *
- * \sa SDL_SIMDGetAlignment
- * \sa SDL_SIMDAlloc
- * \sa SDL_SIMDFree
- */
-extern DECLSPEC void * SDLCALL SDL_SIMDRealloc(void *mem, const size_t len);
-
-/**
- * Deallocate memory obtained from SDL_SIMDAlloc
- *
- * It is not valid to use this function on a pointer from anything but
- * SDL_SIMDAlloc() or SDL_SIMDRealloc(). It can't be used on pointers from
- * malloc, realloc, SDL_malloc, memalign, new[], etc.
- *
- * However, SDL_SIMDFree(NULL) is a legal no-op.
- *
- * The memory pointed to by `ptr` is no longer valid for access upon return,
- * and may be returned to the system or reused by a future allocation. The
- * pointer passed to this function is no longer safe to dereference once this
- * function returns, and should be discarded.
- *
- * \param ptr The pointer, returned from SDL_SIMDAlloc or SDL_SIMDRealloc, to
- *            deallocate. NULL is a legal no-op.
- *
- * \since This function is available since SDL 3.0.0.
- *
- * \sa SDL_SIMDAlloc
- * \sa SDL_SIMDRealloc
- */
-extern DECLSPEC void SDLCALL SDL_SIMDFree(void *ptr);
-
 /* Ends C function definitions when using C++ */
 #ifdef __cplusplus
 }