[PATCH] fix for CGDebugInfo.cpp filename append

[Yaron Keren]

Hi,

Filename appending in CGDebugInfo.cpp was implemented as simple string
concatenation, resulting in duplicate file debug information on Windows due
to wrong path separator.

The patch uses  llvm::sys::path::append to properly append the filename on
all OS.

Is there a way to use path::append without the SmallString temporary?

Yaron
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