[patch] Use unaligned access on x86_64

[Rafael Espíndola]

Hi,

x86_64 has exquisite support for unaligned loads. It is a shame not to use it.

The attached patch avoids aligning archive members on x86_64. The
results when linking clang are very interesting:

* massif reports that the malloc memory usage goes from 331,295,192
bytes to just 133,415,136 bytes.

* the linking time (30 runs average) goes from

1.310065610 seconds time elapsed ( +-  0.19% )

to

1.162564763 seconds time elapsed ( +-  0.14% )


Cheers,
Rafael


2015-04-24  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>

* fileread.cc (find_or_make_view): Don't align on x86_64.
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