[analyzer] Fix test triple in missing-bind-temporary.cpp.

Otherwise the default triple for x86-windows-msvc2015 auto-inserts
__attribute__((thiscall)) to some calls.

Fixes the respective buildbot.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@328903 91177308-0d34-0410-b5e6-96231b3b80d8