Merging r353905:

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r353905 | hubert.reinterpretcast | 2019-02-12 16:55:30 -0800 (Tue, 12 Feb 2019) | 17 lines

[xray][tests][RHDTS] Add -lstdc++ after LLVM libs, resolving link error with RHDTS

Summary:
A link error was encountered when using the Red Hat Developer Toolset.
In the RHDTS, `libstdc++.so` is a linker script that may resolve symbols
to a static library. This patch places `-lstdc++` later in the ordering.

Reviewers: sfertile, nemanjai, tstellar, dberris

Reviewed By: dberris

Subscribers: dberris, mgorny, delcypher, jdoerfert, #sanitizers, llvm-commits

Tags: #llvm, #sanitizers

Differential Revision: https://reviews.llvm.org/D58144

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llvm-svn: 362765