[LLVMdev] [patch] emit .weak for zero initialized weak variables

[Rafael Espíndola]

The attached patches makes all backends print a .weak directive for
zero initialized variables. GCC does it on x86-64 and ARM. I assume
that it should be done on all architectures.

The patch also adds a test to the ARM backend? Should I copy it to all backends?

Comments?

Thanks,
Rafael

P.S.: I find the doFinalization code a bit confusing. Would you
welcome a cleanup patch?
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