When type-checking a static cast (or the static_cast part of a C-style

When type-checking a static cast (or the static_cast part of a C-style
cast) that is converting to a class type, enumerate its constructors
as in any other direct initialization. This ensures that we get the
proper conversion sequence.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88751 91177308-0d34-0410-b5e6-96231b3b80d8