User c-tor name to fix the sanitizer test

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220030 91177308-0d34-0410-b5e6-96231b3b80d8
D5775: Fix of assertion failure in case of non-POD unions with bitfields. Patch by Evgeny Astigeevich!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220031 91177308-0d34-0410-b5e6-96231b3b80d8
D5775: The new test case was missing from the preceding commit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220032 91177308-0d34-0410-b5e6-96231b3b80d8