[patch] EXPORTED_SYMBOL_FILE support for cmake

[Nico Weber]

Hi,

while trying to port the dead code stripping patch (r198087) to cmake, I
noticed that the cmake build has no real support for EXPORTED_SYMBOL_FILE –
libclang in clang had half an implementation for Darwin with a FIXME for
other platforms, tools/gold had half an implementation for BFD ld…

This patch tries to add real support – CMakeLists.txt just need to set
LLVM_EXPORTED_SYMBOL_FILE and things should Just Work.

I've only tested this on OS X, and I don't have a ton of cmake experience.
Please review, and / or patch this in and build and let me know how it goes
(especially on linux or windows).

Nico
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