[llvm] r193718 - Produce .weak_def_can_be_hidden for some linkonce_odr values

[Rafael Espíndola]

> In the message where you gave the count of symbols, you said you had built with xcode 5 tools.  On MacOSX you can run:
>    nm -m <binary> | grep "weak external" | wc -l
> to get the count of weak external symbols in binary.  (On darwin, weak external symbols are much more expensive the other symbols).

On the old binary "nm -m bin/clang | grep "weak external" | grep -v
"\(undefined\)"  | wc -l" prints 2677. On the new binary 426.

The list of the new binary is attached. The difference from the LTO
list is just the weak_odr symbols. Doing

grep 'define linkonce_odr\|define weak_odr\|= weak_odr '

on the combined .ll file found 422 GlobalValues.

Cheers,
Rafael
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