Reid Kleckner 6f3406df67 Re-land "[codeview] Emit information about global variables" ...

This reverts commit r271962 and reinstantes r271957.

MSVC's linker doesn't appear to like it if you have an empty symbol
substream, so only open a symbol substream if we're going to emit
something about globals into it.

Makes check-asan pass.

llvm-svn: 271965

2016-06-07 00:02:03 +00:00

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