aot loader: Call os_mmap with MMAP_MAP_32BIT only when target is x86-64 or riscv64 (#3755)

Mac on aarch64 uses posix_memmap.c os_mmap which doesn't do anything with
the flag MMAP_MAP_32BIT for that build so this condition ends up asserting unless
the mapping ends up in the first 4 gigs worth of addressable space.

Thsi PR changes to call os_mmap with MMAP_MAP_32BIT flag only when the target
is x86-64 or riscv64, and the macro __APPLE__ isn't enabled. The behavior is similar
to what the posix os_mmap does.

core/iwasm/aot/aot_loader.c

@@ -302,7 +302,10 @@ loader_mmap(uint32 size, bool prot_exec, char *error_buf, uint32 error_buf_size)
     int map_flags;
     void *mem;
 
-#if UINTPTR_MAX == UINT64_MAX
+#if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64) \
+    || defined(BUILD_TARGET_RISCV64_LP64D)                       \
+    || defined(BUILD_TARGET_RISCV64_LP64)
+#ifndef __APPLE__
     /* The mmapped AOT data and code in 64-bit targets had better be in
        range 0 to 2G, or aot loader may fail to apply some relocations,
        e.g., R_X86_64_32/R_X86_64_32S/R_X86_64_PC32/R_RISCV_32.
@@ -316,6 +319,7 @@ loader_mmap(uint32 size, bool prot_exec, char *error_buf, uint32 error_buf_size)
         bh_assert((uintptr_t)mem < INT32_MAX);
         return mem;
     }
+#endif
 #endif
 
     map_flags = MMAP_MAP_NONE;