Avoid slow code loading of BEAM code in a hipe-enabled emulator

On my Linux computer, building the entire Erlang/OTP system
with hipe disabled took about 8 minutes. With hipe enabled,
but without any native code, the build took about 23 minutes,
i.e. more than 3 times slower. (The computer has 4 cores, and
I used 'make -j6'.)

On my eight-core Mac (running 'make -j10') there was only a slight
slowdown when hipe was enabled.

The culprit is hipe_unified_loader:post_beam_load/1, which will be
called every time a module is loaded (even if the module contains no
native code). If post_beam_load/1 is called in a hipe-enabled
emulator, it will block multi-scheduling, even if no work needs to be
done. Apparently the cost for blocking multi-scheduling can vary
greatly, depending on the operating system and system load.

As a quick and conservative fix, don't call post_beam_load/1 unless
some native code has been previously loaded.

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