[PATCH] Use shouldAssumeDSOLocal in classifyGlobalReference.

[Rafael Espíndola via llvm-commits]

And teach shouldAssumeDSOLocal that ppc has no copy relocations.

The resulting code handlen a few more case than before. For example, it
knows that a weak symbol can be resolved to another .o file, but it
will still be in the main executable.

Cheers,
Rafael
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