Merging r213714:
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r213714 | compnerd | 2014-07-23 02:32:32 +0100 (Wed, 23 Jul 2014) | 4 lines

test: add an explicit target triple

Now that we support WoA, this test fails on ARM build bots as __va_start has a
different signature on different architectures.
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_35@214110 91177308-0d34-0410-b5e6-96231b3b80d8