feat(mem-alloc): add aligned allocation API declaration

Add mem_allocator_malloc_aligned() API with support for both
GC_VERIFY enabled and disabled modes.

Related to DESIGN_ALIGNED_ALLOC.md

Author: lum1n0us

core/shared/mem-alloc/mem_alloc.h

@@ -46,6 +46,34 @@ mem_allocator_realloc(mem_allocator_t allocator, void *ptr, uint32_t size);
 void
 mem_allocator_free(mem_allocator_t allocator, void *ptr);
 
+/* Aligned allocation support */
+#ifndef GC_MIN_ALIGNMENT
+#define GC_MIN_ALIGNMENT  8
+#endif
+
+#if BH_ENABLE_GC_VERIFY == 0
+
+void *
+mem_allocator_malloc_aligned(mem_allocator_t allocator, uint32_t size,
+                              uint32_t alignment);
+
+#define mem_allocator_malloc_aligned_internal(allocator, size, alignment, \
+                                              file, line) \
+    mem_allocator_malloc_aligned(allocator, size, alignment)
+
+#else /* BH_ENABLE_GC_VERIFY != 0 */
+
+void *
+mem_allocator_malloc_aligned_internal(mem_allocator_t allocator,
+                                      uint32_t size, uint32_t alignment,
+                                      const char *file, int line);
+
+#define mem_allocator_malloc_aligned(allocator, size, alignment) \
+    mem_allocator_malloc_aligned_internal(allocator, size, alignment, \
+                                          __FILE__, __LINE__)
+
+#endif /* end of BH_ENABLE_GC_VERIFY */
+
 int
 mem_allocator_migrate(mem_allocator_t allocator, char *pool_buf_new,
                       uint32 pool_buf_size);