Re-enable the test disabled in r353836 and hopefully make it pass in gcc builds

Argument evaluation order is different between gcc and clang, so pull out
the Builder calls to make the generated IR independent of the host compiler's
argument evaluation order.  Thanks to rnk for reminding me of this clang/gcc
difference.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@353969 91177308-0d34-0410-b5e6-96231b3b80d8