Previously, the daemon determined the architecture of the target `dex2oat` binary based on its own process architecture (`Process.is64Bit()`).
On Android 10, `/apex/com.android.runtime/bin/dex2oat` is frequently a 32-bit binary, even on 64-bit devices.
This caused the daemon to incorrectly treat the target as 64-bit and mount the 64-bit wrapper (`bin/dex2oat64`). Consequently, the wrapper attempted to execute the 32-bit binary using `linker64`, resulting in a crash: `error: "/apex/.../dex2oat" is 32-bit instead of 64-bit`
This commit changes the logic to inspect the ELF header of the target binary. We now explicitly check `e_ident[EI_CLASS]` to determine if the file is 32-bit or 64-bit and assign it to the correct mounting slot. This ensures the 32-bit wrapper is mounted over 32-bit targets, preventing the linker mismatch.
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