[PATCH] Adding an -exported-symbol flag to llvm-lto

[Tom Roeder]

The attached patch adds a flag -exported-symbol to llvm-lto; symbols
passed to this flag are added to the list of symbols preserved by the
LTO pass. This makes llvm-lto more useful for testing LTO directly,
since it makes it easier to write simple code that doesn't get
completely eliminated by the optimizations.

I've added a test case to the existing LTO test, using llvm-objdump to
disassemble the object file generated by llvm-lto and checking to make
sure the symbol was or wasn't eliminated.

Please let me know what you think.

Thanks,

Tom
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