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[libunwind] Remove __FILE__ and __LINE__ from error reporting

Authored by leonardchan on Mar 10 2020, 6:58 PM.

Description

[libunwind] Remove FILE and LINE from error reporting

We were seeing non-deterministic binary size differences depending on which
toolchain was used to build fuchsia. This is because libunwind embeded the
FILE path into a logging macro, even for release builds, which makes the code
dependent on the build directory.

This removes the file and line number from the error message. This is
consistent with how other runtimes report error, e.g.
https://github.com/llvm/llvm-project/blob/master/libcxxabi/src/abort_message.cpp#L30.

Differential Revision: https://reviews.llvm.org/D75890

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