[LLVMdev] Section specialization & COFF.

[r4start]

Hi all.

While compiling next code
@A = weak unnamed_addr constant { i32, i32, i32 } { i32 0, i32 0, i32 0 
}, section ".data"
was discovered that llc ignores weak linkage if we emit it in COFF object.
Attached patch solves this problem, please review.

I found some similar tests in test/Objects/Inputs. Should I do something 
like trivial.ll checking or there is a better way
to check patch behaviour?

  - Dmitry Sokolov.
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