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Re-land "[codeview] Emit information about global variables"

Description

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.

Details

Committed
rnkJun 6 2016, 5:02 PM
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rL271964: Try one more time to pacify -Wpessimizing-move, MSVC, libstdc++4.7, and theā€¦
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