[patch][rfc] "alias weak" X "weak alias"

[Rafael Espíndola]

It always amused me that we have

@a = weak global ...
but
@b = alias weak ...

I decided to dig why that is. The best I could find was

http://llvm.org/bugs/show_bug.cgi?id=1017#c15

Looking at some really old cold then suggests that the reason was that
the old bison based parser hard a reduction for alias linkages and
another one for global variable linkages. Putting the alias first
avoided the reduce/reduce conflict.

The days of the old .ll parser are long gone, but is it too late to
change? In case it is not, the attached patches implement just that
:-)

Cheers,
Rafael
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