[PATCH] Add .eh_frame_hdr search to Linux unwinder.

[Dan Albert]

This is passing all of the tests for x86_64, but I'm still having some (seemingly unrelated trouble) with x86. On x86, I'm seeing a bogus return address coming from the CFI here: https://github.com/llvm-mirror/libcxxabi/blob/master/src/Unwind/DwarfInstructions.hpp#L187 So far I haven't had any luck in figuring out why.

In theory this should work for aarch64 too, but I haven't had a chance to test that.

The commit message is actually not correct. This should work for the BSDs as well.


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http://reviews.llvm.org/D6848

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