Merging r322875:

Merging r322875:
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r322875 | dim | 2018-01-18 19:39:13 +0100 (Thu, 18 Jan 2018) | 9 lines

Add a -no-libcxxabi option to the test-release.sh script.

On FreeBSD, it is currently not possible to build libcxxabi and link
against it, so we have been building releases with -no-libs for quite
some time.

However, libcxx and libunwind should build without problems, so provide
an option to skip just libcxxabi.

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Merging r322879:
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r322879 | dim | 2018-01-18 20:30:30 +0100 (Thu, 18 Jan 2018) | 2 lines

Follow-up to rL322875 by initializing the do_libcxxabi variable properly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@323038 91177308-0d34-0410-b5e6-96231b3b80d8