[patch][p22623] Don't get confused with __attribute__((weak)) in static inits

[Rafael Espíndola]

On trunk we avoid the bug by explicitly putting the variable in a
comdat and using that to decide whether the init function should be in
a comdat or not.

The attached patch is a targeted fix for the 3.6 branch: Just avoid
using the IR level linkage since weak doesn't necessary mean that it
is safe to use comdats.

Cheers,
Rafael
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