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[OpenEmbedded] Explicitly specify -rtlib in tests

Authored by phosek on Jul 31 2018, 8:30 PM.

Description

[OpenEmbedded] Explicitly specify -rtlib in tests

Tests added in r338294 implicitly assume that libgcc is the runtime library,
but that's not the case when the user configures Clang to use compiler-rt in
which case these tests will break. Explicitly request libgcc when invoking
clang in these tests to avoid that.

Differential Revision: https://reviews.llvm.org/D50123

llvm-svn: 338482